fix: adding 'Setting up a local development environment'

README.md

@@ -45,6 +45,23 @@ Please consider [sponsoring](https://github.com/sponsors/frikky) the project if
 ## Documentation
 [Documentation](https://shuffler.io/docs) can be found on [https://shuffler.io/docs](https://shuffler.io/docs) and is written here: [https://github.com/frikky/shuffle-docs](https://github.com/frikky/shuffle-docs).
 
+### Setting up a local development environment
+
+For the backend, you need to have [Go](https://golang.org/doc/install) installed. For the frontend, you need to have [Node.js](https://nodejs.org/en/download/) installed.
+
+Checkout [this](./backend/README.md) to get started with running the backend locally.
+You can run the frontend locally by running the following commands:
+
+```bash
+cd frontend
+yarn install
+yarn start
+```
+
+And then, you can access the frontend at [http://localhost:3000](http://localhost:3000).
+
+Make sure to also start the database by running `docker-compose up opensearch -d` in the root directory.
+
 ## Related repositories
 * OpenAPI apps: [https://github.com/frikky/security-openapis](https://github.com/frikky/security-openapis)
 * Documentation: [https://github.com/frikky/shuffle-docs](https://github.com/frikky/shuffle-docs)