Add documentation for Province, Resource Node Data, Terrain Data, and Throne City

- Created a new document for Province detailing its characteristics and improvements.
- Added Resource Node Data documentation, including resource types, effects, and raw data tables.
- Introduced Terrain Data documentation, outlining terrain types, effects, and improvements available.
- Documented Throne City, highlighting its unique feature of providing extra gold income.

docs/_Tasks Kanban.base

@@ -35,8 +35,10 @@ views:
           - Setup Test Database.md
           - Find the Gold Cost Rush Formula.md
           - Dark Mode UI.md
-        Working On:
           - Building Plan Calculator.md
+          - Load Game Data Into Build Calculator.md
+        Working On:
+          - Collect Data.md
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