Add docs on netcode musing

docs/net_proto.md

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+### Net protocol
+
+So the main aspect of this is that each player is tied to a Matrix account. I'll probably set up a wormy.half-shot.uk Matrix server,
+for users to obtain a profile for. 
+
+Each game is tied to a particular Matrix room, which does the following:
+
+ - Contains a set of players, using `m.room.message` for chat functionality.
+ - Spectators can join the game simply by joining the room.
+ - There will be a hard cap on teams by default (8), although this could be extended.
+ - The game configuration is stored in room state (`uk.half-shot.uk.wormgine.game_config`)
+ - The game map is stored in the content repository as a PNG.
+ - The game entity state / placement is stored in the yet-to-be-defined JSON file in the content repository.
+
+Power levels are used to determine who can change the game state, by default this is only the
+owner.
+
+To start the game, the admin will send a `uk.half-shot.uk.wormgine.start` event which will trigger all the clients
+to begin a load sequence. Once everyone has loaded in, they will reply to the even with a `uk.half-shot.uk.wormgine.loaded`
+event.
+
+Then, the admin of the game takes over arbitrating the round. The sequence is roughly as follows:
+
+ - `uk.half-shot.uk.wormgine.game_state` -> new round, full copy of all entity states.
+ - `uk.half-shot.uk.wormgine.ack` -> is sent by the player who's turn it is. If they take longer than 10 seconds to respond, their turn is forfeit.
+ - `uk.half-shot.uk.wormgine.control` -> the active player will send control events to move their worm.
+ - (The game will simulate a controller being pressed, the worm state should be synced up)
+ - `uk.half-shot.uk.wormgine.bitmap` -> updated area of the bitmap whenever damage is dealt to it, encoded as b64.
+ - Once the player has taken their turn, the logic rotates and a new round has begun.
+
+Extra details:
+
+ - 
+ - If a player leaves the room, their teams are automatically dropped.
+ - If there is a win or a draw, the game ends with a final `uk.half-shot.uk.wormgine.game_state` before being dumped back into the lobby.
+ - A new `uk.half-shot.uk.wormgine.start` can be issued to start another game.