part 12 done

Pt12/part12-containers-applications/todo-app/todo-backend/README.md

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+# Express application
+
+Install dependencies with `npm install`
+
+Run with `npm start`
+
+Or in development mode with `npm run dev`
+
+# Visit counter
+
+When running the server, visit http://localhost:3000 to see visit counter, or give environment variable `PORT` to change the port.
+
+# MongoDB
+
+The application has /todos crud which requires a MongoDB. Pass connection url with env `MONGO_URL`
+
+# Redis
+
+Pass connection url with env `REDIS_URL`