feat(pos): scaffold project structure and Flask app

pos/app.py

@@ -0,0 +1,14 @@
+from flask import Flask
+
+def create_app():
+    app = Flask(__name__)
+
+    @app.route('/pos/health')
+    def health():
+        return {'status': 'ok'}
+
+    return app
+
+if __name__ == '__main__':
+    app = create_app()
+    app.run(host='0.0.0.0', port=5001, debug=True)