docs: global docstrings

Issue: #13

src/config.py

@@ -1,8 +1,10 @@
 """
-Global configurations: import settings, app_configs
+Global configurations
 
-Classes:
+Exports:
  - CustomBaseSettings - Base class to be used by all modules for loading configs
+ - settings: Global configurations object
+ - app_configs: Dict generated from configs, used in app initialisation
 """
 
 from typing import Any

src/schemas.py

@@ -1,3 +1,10 @@
+"""
+Global Pydantic schemas
+
+Exports:
+ - CustomBaseModel: Schema used for all other Pydantic models
+ - ResourceName
+"""
 from pydantic import BaseModel
 from typing import Optional