docs: document communities endpoints

Author: plhery

doc/v2.md

@@ -91,6 +91,9 @@ This is a comprehensive guide of all methods available for the Twitter API v2 on
     - [Search spaces](#search-spaces)
     - [Space buyers](#space-buyers)
     - [Space tweets](#space-tweets)
+  - [Communities](#communities)
+    - [Community by id](#community-by-id)
+    - [Search communities](#search-communities)
   - [Direct messages (DMs)](#direct-messages-dms)
     - [Fetch direct message events (without filter)](#fetch-direct-message-events-without-filter)
     - [Fetch direct message events by participant id](#fetch-direct-message-events-by-participant-id)
@@ -1534,6 +1537,52 @@ const { data: tweets } = await client.v2.spaceTweets('space-id')
 // tweets is a TweetV2[]
 ```
 
+## Communities
+
+### Community by id
+
+Returns a variety of information about a single Community specified by ID.
+
+**Method**: `.community()`
+
+**Endpoint**: `communities/:id`
+
+**Right level**: `Read-only`
+
+**Arguments**:
+- `communityId: string`
+- `options?: CommunityByIDV2Params`
+
+**Returns**: `CommunityV2Result`
+
+**Example**
+```ts
+const { data: community } = await client.v2.community('12345', {
+  expansions: ['creator_id'],
+});
+```
+
+### Search communities
+
+Search for Communities based on keywords.
+
+**Method**: `.searchCommunities()`
+
+**Endpoint**: `communities/search`
+
+**Right level**: `Read-only`
+
+**Arguments**:
+- `query: string`
+- `options?: CommunitySearchV2Params`
+
+**Returns**: `CommunitiesV2Result`
+
+**Example**
+```ts
+const { data: communities } = await client.v2.searchCommunities('typescript');
+```
+
 ## Direct messages (DMs)
 
 ### Fetch direct message events (without filter)