add code documentation

DbSetup.py

@@ -1,3 +1,7 @@
+"""Script to initialize the database.
+     Serves database url, engine, connection and session.
+"""
+
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session
 from sqlalchemy.ext.declarative import declarative_base
@@ -9,4 +13,6 @@ session = Session(engine)
 Base = declarative_base()
 
 def init_db():
+     """Initialize the database.
+     """
      Base.metadata.create_all(bind=engine)