add follow packs to nip51 (nostr-protocol#1898)

Author: fiatjaf

51.md

@@ -22,6 +22,7 @@ For example, _mute list_ can contain the public keys of spammers and bad actors
 
 | name              | kind  | description                                                 | expected tag items                                                                                  |
 | ---               | ---   | ---                                                         | ---                                                                                                 |
+| Follow list       |     3 | microblogging basic follow list, see [NIP-02](02.md)        | `"p"` (pubkeys -- with optional relay hint and petname)                                             |
 | Mute list         | 10000 | things the user doesn't want to see in their feeds          | `"p"` (pubkeys), `"t"` (hashtags), `"word"` (lowercase string), `"e"` (threads)                     |
 | Pinned notes      | 10001 | events the user intends to showcase in their profile page   | `"e"` (kind:1 notes)                                                                                |
 | Read/write relays | 10002 | where a user publishes to and where they expect mentions    | see [NIP-65](65.md)                                                                                 |
@@ -33,6 +34,7 @@ For example, _mute list_ can contain the public keys of spammers and bad actors
 | Simple groups     | 10009 | [NIP-29](29.md) groups the user is in                       | `"group"` ([NIP-29](29.md) group id + relay URL + optional group name), `"r"` for each relay in use |
 | Favorite relays   | 10012 | user favorite relays and pointers to relay sets             | `"relay"` (relay URLs) and `"a"` (kind:30002 relay set)                                             |
 | Interests         | 10015 | topics a user may be interested in and pointers             | `"t"` (hashtags) and `"a"` (kind:30015 interest set)                                                |
+| Media follows     | 10020 | multimedia (photos, short video) follow list                | `"p"` (pubkeys -- with optional relay hint and petname)                                             |
 | Emojis            | 10030 | user preferred emojis and pointers to emoji sets            | `"emoji"` (see [NIP-30](30.md)) and `"a"` (kind:30030 emoji set)                                    |
 | DM relays         | 10050 | Where to receive [NIP-17](17.md) direct messages            | `"relay"` (see [NIP-17](17.md))                                                                     |
 | Good wiki authors | 10101 | [NIP-54](54.md) user recommended wiki authors               | `"p"` (pubkeys)                                                                                     |
@@ -58,6 +60,8 @@ Aside from their main identifier, the `"d"` tag, sets can optionally have a `"ti
 | 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) |
 | App curation sets     | 30267 | references to multiple software applications                                                 | `"a"` (software application event)                                                  |
+| Starter packs         | 39089 | a named set of profiles to be shared around with the goal of being followed together         | `"p"` (pubkeys)                                                                     |
+| Media starter packs   | 39092 | same as above, but specific to multimedia (photos, short video) clients                      | `"p"` (pubkeys)                                                                     |
 
 ### Deprecated standard lists