added design document

design/Core.md

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+# Mechanics
+
+## Movement
+
+Slow and considered.
+The walking speed is slow, the running speed slightly less so.
+Walkable parts of environments are relatively small.
+
+## Combat
+
+
+
+## Exploration
+
+Resources are scattered throughout the environment.
+It should be rewarding to stop and gather them.
+
+## Upgrades
+
+
+
+# Dynamics
+
+## Careful Progress
+
+The player should be careful and considered during second to second gameplay.