feat: add Models+Schema and User Controller

Models/Tenant.py

@@ -0,0 +1,9 @@
+from app import db, ma
+
+class Tenant(db.Model):
+    __tablename__ = "tenants"
+    tenant_id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(50))
+
+    def __repr__(self):
+        return '<Tenant %s>' % self.name