Add README.md with deployment instructions and contribution guidelines

README.md

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+# Mixify
+
+This web app is a participative music app where the crowd can submit
+songs to the DJ in a party. It is open source and open to contributions.
+You will need to deploy the app by yourself, we do not provide hosting.
+
+## How to deploy it
+
+### The easy way
+You will need:
+- git 
+- nodejs
+- pnpm
+
+```bash
+git clone [email protected]:Latte-Corporation/Mixify.git
+cd mixify
+pnpm install
+pnpm start
+```
+
+### The cloud way
+A helm chart is available in the `helm` folder. You can deploy it with:
+```bash
+helm install mixify ./helm
+```
+
+### With docker
+You can also build a docker image with:
+```bash
+docker build -t mixify .
+docker run -p 3000:3000 mixify
+```
+
+## How to contribute
+You can contribute by submitting a pull request. We will review it and
+merge it if it fits the project. You can also open an issue if you have
+a feature request or a bug to report.
+
+