docs: added protocol specification

protocol.md

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+# Protocol Specification
+
+The game communicates actions to the other flipper using an array of three bytes. The first byte indicates the player and the action that the player performed. The second two bytes contain the X and Y coordinates of the location of that action.
+
+## First Byte
+
+| Bit | Description |
+| ----| ----------- |
+| 0   | Unused      |
+| 1   | Unused      |
+| 2   | Unused      |
+| 3   | Player      |
+| 4-7 | Action      |
+
+The 3rd bit denotes the player:
+
+0. Fox
+1. Wolf
+
+Bits 4-7 denote the action:
+
+| Value  | Action                                                              |
+| -------| ------------------------------------------------------------------- |
+| 0b0000 | (Reserved)                                                          |
+| 0b0001 | The player moved to the location specified in bytes 2 and 3         |
+| 0b0010 | The player dropped a bomb at the location specified in bytes 2 and 3|
+| 0b0011 | The player died. (Location bytes unused and should be set to 0x00)  |
+
+### Example:
+
+**0x11 0x02 0x03**
+The wolf has moved to position (2, 3)
+
+**0x02 0x05 0x01**
+The fox has placed a bomb in position (5, 1)
+
+**0x13 0x00 0x00**
+The wolf has died
+