Add 'Repository Structure'

Repository-Structure.md

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+# This document describes what is the current folder structure in the Liblast repository.
+
+
+* Asset Sources - place to store project files and resources used to create assets, that are not directly used in the game
+    * Audio
+    * Characters
+    * Decals
+    * Effects
+    * HUD
+    * Maps
+    * Props
+    * Weapons
+* Design - files that are not directly used in the  game or asset creation, but are useful in the design process
+* Game - the root of the Godot game project
+    * .godot - Godot's asset import cache and other temporary files
+    * Assets - all game assets
+        * Announcer - announcer lines
+        * Audio - code and nodes used for audio playback
+        * Characters - everything used for game characters
+        * Decals - textures and nodes used for spawnable decals like blood splats, bullet holes etc.
+        * Effects - textures and nodes used for spawnable effects like bullet hits, gibs etc.
+        * Fonts - externally sourced fonts
+        * HUD - everything used for rendering the Head's Up Display in the game
+        * MapComponents - deprecated?
+        * Maps - everything related to maps
+        * Materials - in teh future this should be a global library of materials to be used in maps
+        * Props - decorative objects used in maps
+        * SFX - audio files for sound effects
+        * Shaders - not used
+        * UI - everything related to the game UI (menu system), not to be confused with the HUD
+        * Weapons - nodes, models and textures for weapons
+* Godot - Godot editor binaries and export templates currently used with the game (will not be necessary after switching to an official Godot 4 release - this is necessary since we're using nightly builds right now).
+* Screenshots - image files to be embeded in README.md
+