Merge pull request #68 from OpenVic2Project/docs-architecture-and-schema

Docs architecture and schema

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+# Player-Game Interaction
+```mermaid
+sequenceDiagram
+actor Player
+participant UI as Godot
+participant Bridge as Godot-CPP Bridge
+participant Simulation
+participant Dataloader
+autonumber
+
+Player ->> UI: Program starts
+UI ->> Bridge: Godot autoloaders fire
+Bridge ->> Dataloader: Signal to load Simulation
+Dataloader ->> Simulation: Read in data from file(s)
+Simulation ->> Bridge:  Simulation finished loading data
+Bridge ->> UI: Autoloaders finish
+UI ->> Player: Display Main Menu
+Player ->> UI: Press "New Game" or<br>"Load Game" button
+UI ->> Bridge: Begin new Game Session
+Bridge ->> Simulation: Start new Game Session
+Simulation -->> Dataloader: Load previous savegame<br>(If necessary)
+Dataloader -->> Simulation: 
+Simulation ->> Bridge: Provide information necessary<br>for UI and visual elements
+Bridge ->> UI: Signal that Game Session<br> is ready for interaction
+UI ->> Player: Present to Player
+
+loop Core Game Loop
+Player ->> UI: Interact with game controls
+UI ->> Bridge: Convey player intent<br>according to UI<br>handler functions 
+Bridge ->> Simulation: Relay changes to entities<br>controlled by the Player
+Note over Simulation: When unpaused:
+Simulation ->> Simulation: Advance to next in-game day<br>according to game speed<br>and update Simulation state
+Simulation ->> Bridge: Inform of relevant<br>changes to game state
+Bridge ->> UI: Update UI and map
+UI ->> Player: Display new data
+end
+
+opt Save Game
+Player ->> UI: Press "Save Game" button<br>in the Game Session Menu
+UI ->> Bridge: Demand that the current<br>game state is saved
+Bridge ->> Simulation: Begin save routines
+Simulation ->> Dataloader: Write current state to disk
+Simulation ->> Bridge: Save routines completed
+Bridge ->> UI: Trigger "successful save"<br>message
+UI ->> Player: Give visual confirmation<br>of successful save
+end
+
+Player ->> UI: Press "Exit Game" button
+UI ->> Player: Give a "Confirm quit (Y/N)"<br>dialog window
+Player ->> UI: Confirm intent to quit program
+UI ->> Player: Program closes
+```
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