Add initial Nodeinfo document

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+# Nodeinfo
+
+See also [the Nodeinfo standard](https://nodeinfo.diaspora.software/).
+
+## `/.well-known/nodeinfo`
+### The well-known path
+* Method: `GET`
+* Authentication: not required
+* Params: none
+* Response: JSON
+* Example response:
+```json
+{
+   "links":[
+      {
+         "href":"https://example.com/nodeinfo/2.0.json",
+         "rel":"http://nodeinfo.diaspora.software/ns/schema/2.0"
+      },
+      {
+         "href":"https://example.com/nodeinfo/2.1.json",
+         "rel":"http://nodeinfo.diaspora.software/ns/schema/2.1"
+      }
+   ]
+}
+```
+
+## `/nodeinfo/2.0.json`
+### Nodeinfo 2.0
+* Method: `GET`
+* Authentication: not required
+* Params: none
+* Response: JSON
+* Example response:
+```json
+{
+   "metadata":{
+      "accountActivationRequired":false,
+      "features":[
+         "pleroma_api",
+         "mastodon_api",
+         "mastodon_api_streaming",
+         "polls",
+         "pleroma_explicit_addressing",
+         "shareable_emoji_packs",
+         "multifetch",
+         "pleroma:api/v1/notifications:include_types_filter",
+         "chat",
+         "shout",
+         "relay",
+         "pleroma_emoji_reactions",
+         "pleroma_chat_messages"
+      ],
+      "federation":{
+         "enabled":true,
+         "exclusions":false,
+         "mrf_hashtag":{
+            "federated_timeline_removal":[
+               
+            ],
+            "reject":[
+               
+            ],
+            "sensitive":[
+               "nsfw"
+            ]
+         },
+         "mrf_object_age":{
+            "actions":[
+               "delist",
+               "strip_followers"
+            ],
+            "threshold":604800
+         },
+         "mrf_policies":[
+            "ObjectAgePolicy",
+            "TagPolicy",
+            "HashtagPolicy"
+         ],
+         "quarantined_instances":[
+            
+         ]
+      },
+      "fieldsLimits":{
+         "maxFields":10,
+         "maxRemoteFields":20,
+         "nameLength":512,
+         "valueLength":2048
+      },
+      "invitesEnabled":false,
+      "mailerEnabled":false,
+      "nodeDescription":"Pleroma: An efficient and flexible fediverse server",
+      "nodeName":"Example",
+      "pollLimits":{
+         "max_expiration":31536000,
+         "max_option_chars":200,
+         "max_options":20,
+         "min_expiration":0
+      },
+      "postFormats":[
+         "text/plain",
+         "text/html",
+         "text/markdown",
+         "text/bbcode"
+      ],
+      "private":false,
+      "restrictedNicknames":[
+         ".well-known",
+         "~",
+         "about",
+         "activities",
+         "api",
+         "auth",
+         "check_password",
+         "dev",
+         "friend-requests",
+         "inbox",
+         "internal",
+         "main",
+         "media",
+         "nodeinfo",
+         "notice",
+         "oauth",
+         "objects",
+         "ostatus_subscribe",
+         "pleroma",
+         "proxy",
+         "push",
+         "registration",
+         "relay",
+         "settings",
+         "status",
+         "tag",
+         "user-search",
+         "user_exists",
+         "users",
+         "web",
+         "verify_credentials",
+         "update_credentials",
+         "relationships",
+         "search",
+         "confirmation_resend",
+         "mfa"
+      ],
+      "skipThreadContainment":true,
+      "staffAccounts":[
+         "https://example.com/users/admin",
+         "https://example.com/users/staff"
+      ],
+      "suggestions":{
+         "enabled":false
+      },
+      "uploadLimits":{
+         "avatar":2000000,
+         "background":4000000,
+         "banner":4000000,
+         "general":16000000
+      }
+   },
+   "openRegistrations":true,
+   "protocols":[
+      "activitypub"
+   ],
+   "services":{
+      "inbound":[
+         
+      ],
+      "outbound":[
+         
+      ]
+   },
+   "software":{
+      "name":"pleroma",
+      "version":"2.4.1"
+   },
+   "usage":{
+      "localPosts":27,
+      "users":{
+         "activeHalfyear":129,
+         "activeMonth":70,
+         "total":235
+      }
+   },
+   "version":"2.0"
+}
+```
+
+## `/nodeinfo/2.1.json`
+### Nodeinfo 2.1
+* Method: `GET`
+* Authentication: not required
+* Params: none
+* Response: JSON
+* Example response:
+```json
+{
+   "metadata":{
+      "accountActivationRequired":false,
+      "features":[
+         "pleroma_api",
+         "mastodon_api",
+         "mastodon_api_streaming",
+         "polls",
+         "pleroma_explicit_addressing",
+         "shareable_emoji_packs",
+         "multifetch",
+         "pleroma:api/v1/notifications:include_types_filter",
+         "chat",
+         "shout",
+         "relay",
+         "pleroma_emoji_reactions",
+         "pleroma_chat_messages"
+      ],
+      "federation":{
+         "enabled":true,
+         "exclusions":false,
+         "mrf_hashtag":{
+            "federated_timeline_removal":[
+               
+            ],
+            "reject":[
+               
+            ],
+            "sensitive":[
+               "nsfw"
+            ]
+         },
+         "mrf_object_age":{
+            "actions":[
+               "delist",
+               "strip_followers"
+            ],
+            "threshold":604800
+         },
+         "mrf_policies":[
+            "ObjectAgePolicy",
+            "TagPolicy",
+            "HashtagPolicy"
+         ],
+         "quarantined_instances":[
+            
+         ]
+      },
+      "fieldsLimits":{
+         "maxFields":10,
+         "maxRemoteFields":20,
+         "nameLength":512,
+         "valueLength":2048
+      },
+      "invitesEnabled":false,
+      "mailerEnabled":false,
+      "nodeDescription":"Pleroma: An efficient and flexible fediverse server",
+      "nodeName":"Example",
+      "pollLimits":{
+         "max_expiration":31536000,
+         "max_option_chars":200,
+         "max_options":20,
+         "min_expiration":0
+      },
+      "postFormats":[
+         "text/plain",
+         "text/html",
+         "text/markdown",
+         "text/bbcode"
+      ],
+      "private":false,
+      "restrictedNicknames":[
+         ".well-known",
+         "~",
+         "about",
+         "activities",
+         "api",
+         "auth",
+         "check_password",
+         "dev",
+         "friend-requests",
+         "inbox",
+         "internal",
+         "main",
+         "media",
+         "nodeinfo",
+         "notice",
+         "oauth",
+         "objects",
+         "ostatus_subscribe",
+         "pleroma",
+         "proxy",
+         "push",
+         "registration",
+         "relay",
+         "settings",
+         "status",
+         "tag",
+         "user-search",
+         "user_exists",
+         "users",
+         "web",
+         "verify_credentials",
+         "update_credentials",
+         "relationships",
+         "search",
+         "confirmation_resend",
+         "mfa"
+      ],
+      "skipThreadContainment":true,
+      "staffAccounts":[
+         "https://example.com/users/admin",
+         "https://example.com/users/staff"
+      ],
+      "suggestions":{
+         "enabled":false
+      },
+      "uploadLimits":{
+         "avatar":2000000,
+         "background":4000000,
+         "banner":4000000,
+         "general":16000000
+      }
+   },
+   "openRegistrations":true,
+   "protocols":[
+      "activitypub"
+   ],
+   "services":{
+      "inbound":[
+         
+      ],
+      "outbound":[
+         
+      ]
+   },
+   "software":{
+      "name":"pleroma",
+      "repository":"https://git.pleroma.social/pleroma/pleroma",
+      "version":"2.4.1"
+   },
+   "usage":{
+      "localPosts":27,
+      "users":{
+         "activeHalfyear":129,
+         "activeMonth":70,
+         "total":235
+      }
+   },
+   "version":"2.1"
+}
+```
+