NIP-51: add Community sets

Author: zhoreeq

51.md

@@ -56,6 +56,7 @@ Aside from their main identifier, the `"d"` tag, sets can optionally have a `"ti
 | Curation sets         | 30004 | groups of articles picked by users as interesting and/or belonging to the same category      | `"a"` (kind:30023 articles), `"e"` (kind:1 notes)                                   |
 | Curation sets         | 30005 | groups of videos picked by users as interesting and/or belonging to the same category        | `"a"` (kind:21 videos)                                                              |
 | Kind mute sets        | 30007 | mute pubkeys by kinds<br>`"d"` tag MUST be the kind string                                   | `"p"` (pubkeys)                                                                     |
+| Community sets        | 30014 | groups of communities with the same general topic                                            | `"a"` (kind:34550 community definitions)                                            |
 | Interest sets         | 30015 | interest topics represented by a bunch of "hashtags"                                         | `"t"` (hashtags)                                                                    |
 | Emoji sets            | 30030 | categorized emoji groups                                                                     | `"emoji"` (see [NIP-30](30.md))                                                     |
 | Release artifact sets | 30063 | group of artifacts of a software release                                                     | `"e"` (kind:1063 [file metadata](94.md) events), `"a"` (software application event) |