Add support for modules

content/client-server-api/modules/account_data.md

@@ -0,0 +1,32 @@
+---
+type: module
+weight: 190
+---
+
+### Client Config
+
+Clients can store custom config data for their account on their
+homeserver. This account data will be synced between different devices
+and can persist across installations on a particular device. Users may
+only view the account data for their own account
+
+The account\_data may be either global or scoped to a particular rooms.
+
+#### Events
+
+The client receives the account data as events in the `account_data`
+sections of a `/sync`.
+
+These events can also be received in a `/events` response or in the
+`account_data` section of a room in `/sync`. `m.tag` events appearing in
+`/events` will have a `room_id` with the room the tags are for.
+
+#### Client Behaviour
+
+{{account\_data\_cs\_http\_api}}
+
+#### Server Behaviour
+
+Servers MUST reject clients from setting account data for event types
+that the server manages. Currently, this only includes
+[m.fully\_read]().