WIP: Damage/frag system is implemented without ragdolls

docs/characters.md

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+# Characters
+
+## Implementation
+
+Characater is a 3D model (currently based on Mixamo) that must implement certain methods in order to become a "Character". 
+Currently, each character must be able to detect collisions, pass the information about the take damage to its parent controller and dissapear when dying.
+
+
+## How to add a new character?
+
+- Import a mixamo model in the scale of 0.01 in a T-Pose and make it local (Node should be names `model`) 
+- Attach a character script to the main node