Add documentation

man/cagebreak-config.5.md

@@ -81,9 +81,17 @@ configure_message display_time 4
 
 *cursor [enable|disable]*
 	Enable or disable cursor
+
 	This simply hides the cursor. Pointing and clicking is
 	still possible.
 
+*custom_event <message>*
+	Send a custom event to the IPC socket
+
+	This sends an event of time "custom_event" to all programs
+	listening to the IPC socket along with the string <message>.
+	See *cagebreak-socket(7)* for more details.
+
 *definekey <mode> <key> <command>*
 	Bind <key> to execute <command> if pressed in <mode> -
 	*definekey* is a more general version of *bind*.

man/cagebreak-socket.7.md

@@ -113,6 +113,17 @@ cg-ipc{"event_name":"configure_output","output":"eDP-1","output_id":1}
 cg-ipc{"event_name":"cursor_switch_tile","old_output":"eDP-1","old_output_id":1,"old_tile":2,"new_output":"eDP-1","new_output_id":1,"new_tile":3}
 ```
 
+*custom_event*
+	- Trigger: Cagebreak receives the *custom_event* command, either in the config file or via the IPC socket (see *cagebreak-config(5)*).
+	- JSON
+		- event_name: "custom_event"
+		- message: The message passed to the *custom_event* command
+
+```
+custom_event Hello World!
+cg-ipc{"event_name":"custom_event","message":"Hello World!"}
+```
+
 *cycle_outputs*
 	- Trigger: *nextscreen* and *prevscreen* commands
 	- JSON