Starting on rules implementation

RULES.txt

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+- [ ] Movement
+    - [ ] Pawn movement
+    - [ ] Drone movement
+    - [ ] Queen movement
+- [ ] No move reversal
+- [ ] Scoring
+    - Queen: 3
+    - Drone: 2
+    - Pawn: 1
+- [ ] Merging
+    - Pawn + Pawn = Drone (if no drones)
+    - Drone + Drone = Queen (if no queens)
+- [ ] Game over
+    - When one half is empty
+- [ ] Tie breaker
+    - Last player to move wins