docs: doc guidelines in router template

src/_module_template/router.py

@@ -3,6 +3,19 @@ Router endpoints for the <this> module
 
 Exports:
  - router: fastapi.APIRouter
+
+### Router Guidelines ###
+- Add responses to decorators
+- Add status_codes to decorators
+- All endpoints should either return a response object or 204
+- Ensure response_model is declared in the decorator
+- All query and path params should have validation and descriptions
+- All endpoints should have a docstring (this is used in place of a description)
+- All endpoints should have a summary
+- All modules should have metadata in main.py
+- All exceptions should have a custom definition in exceptions.py
+- Dependencies should be used for db model get and validation where possible
+- Verify module level docstring is still accurate after updates
 """
 from fastapi import APIRouter