update lua mod readme

mods/lua/README.md

@@ -1,6 +1,48 @@
 # API
 
-## Lua Commands
+## Events
+
+### Event Types
+
+- `PRIVMSG_SELF - user, host, message`
+- `PRIVMSG_CHAN - user, host, channel, message`
+- `JOIN - user, host, channel`
+- `JOIN_MYSELF - channel`
+- `PART - user, host, channel, reason`
+- `PART_MYSELF - channel, reason`
+- `QUIT - user, host, reason`
+- `NICK - user, host, newnick`
+- `NICK_MYSELF - newnick`
+- `NICK_INUSE - newnick`
+- `CTCP - user, host, to, message`
+- `IRC_CONNECTED`
+- `TICK`
+
+### `add_handler(event, handler)`
+
+Adds a handler for an event.
+
+Example:
+
+```lua
+function msg(user, host, channel, message)
+    print(user .. " said: " .. message)
+end
+
+add_handler(PRIVMSG_CHAN, msg)
+```
+
+### `del_handler(event, handler)`
+
+Removes a handler for an event.
+
+Example:
+
+```lua
+del_handler(PRIVMSG_CHAN, msg)
+```
+
+## IRC Commands
 
 ### `raw(message)`