108536234: created users and roles data and domain model.

You will need to run the /scripts/bootstrap.sh to create the database for test and the app.

app/main/dao/users_dao.py

@@ -0,0 +1,11 @@
+from app import db
+from app.models import Users
+
+
+def insert_user(user):
+    db.session.add(user)
+    db.session.commit()
+
+
+def get_user_by_id(id):
+    return Users.query.filter_by(id=id).first()