README.md in decidim-0.0.7

- old
+ new
@@ -33,9 +33,42 @@
 And then execute:
 ```bash
 $ bundle
 ```
 
+## How to contribute
+
+The technology stack used in this module is the following:
+
+For the backend side:
+  - Ruby on Rails
+  - GraphQL
+
+For the frontend side:
+  - Typescript (introduced in #1001)
+  - React
+  - Apollo
+
+The frontend code can be found in the folder `app/frontend` instead of `app/assets`. We are using Webpack to build the React application so we are keeping the React files in a separate folder and then including the `bundle.js` file using sprockets as usual.
+
+#### Developing React components
+
+You need to execute `yarn start` in a separate terminal, in the `decidim` root folder while you are developing this module. When you are finished you can build the project for production like this: `yarn build:prod`. We are checking in the bundle into the repository.
+
+#### Run tests
+
+You can execute `yarn test` to run the javascript test suite or you can run `yarn test:watch` to listen for file changes.
+
+#### GraphQL schema and Typescript
+
+Since we are using Typescript we can generate interfaces and types from our schema using the following command:
+
+```bash
+  yarn run graphql:generate_schema_types
+```
+
+This command will create a file called `app/frontend/support/schema.ts` that can be used to strict type checking in our components.
+
 ## Contributing
 See [Decidim](https://github.com/AjuntamentdeBarcelona/decidim).
 
 ## License
 See [Decidim](https://github.com/AjuntamentdeBarcelona/decidim).