Add basic Game Design Doc

README.md

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 GMTK 2023
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 Theme: Built To Scale
+
+### Core Loop:
+Player mines base resources
+- Stone -> Mason -> Brick -> Storage
+- Clay -> Furnace -> Rooftiles -> Storage
+- Sand -> Furnace -> Glass -> Storage
+
+Resources are being converted to products  
+The final products are Bricks, Rooftiles, Glass
+
+Final products can be used to build houses (new workers) or be contributed to the world map projects. 
+
+Reaching material milestones unlocks monuments on the world map.
+
+Monuments are predefined buildings with material requirements based on real world references.
+
+E.g. Pyramid of Giza = 2.3m stones
+
+### Mining:
+
+Minig material is manual at first.  
+Once a house has been built 3 workers join the workforce.  
+Workers can be distributed among the base mining facilities to passively mine resources.  
+
+### Production: 
+Each production facility can accomodate workers.  
+Additional workers increase output per workshift.
+
+### World Map
+The world map contains predefined monuments.  
+Reaching enough materials (contributed) to complete a monument unlocks it on the world map.  
+Unlocking all monuments completes the game.
+
+### Optional
+- Additional facility upgrades to decrease shift time
+- Global World map
+- Savegames