feat: add Models+Schema and User Controller

Models/Role.py

@@ -0,0 +1,19 @@
+from app import db, ma
+from Models.Permission import Permission
+
+roles_permissions = db.Table('roles_permissions_mapping',
+    db.Column('role_id', db.Integer, db.ForeignKey('roles.role_id'), primary_key=True),
+    db.Column('permission_id', db.Integer, db.ForeignKey('permissions.permission_id'), primary_key=True)
+)
+
+class Role(db.Model):
+    __tablename__ = "roles"
+    role_id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(50))
+    tenant_id = db.Column(db.Integer, db.ForeignKey("tenants.tenant_id"))
+    tenant = db.relationship("Tenant", backref="roles")
+    permissions = db.relationship('Permission', secondary=roles_permissions, lazy='subquery',
+        backref=db.backref('roles', lazy=True))
+
+    def __repr__(self):
+        return '<Role %s>' % self.role_id