Add README and compose.yaml

Author: olillin

README.md

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+# GräddIT
+
+Calculator website for calculating the ingredients of turquoise whipped cream
+like [P.R.I.T.](https://prit.chalmers.it) makes.
+
+## Deployment
+
+### Using Docker run
+
+```console
+docker run -p "8080:8080" ghcr.io/olillin/graddit:latest
+```
+
+### Using Docker Compose
+
+See [`compose.yaml`](./compose.yaml) for an example.
+
+## Development
+
+Thank you for wanting to contribute! GraddIT is written in plain JavaScript, so
+to start the server simply run:
+
+```console
+node .
+```
+
+All files are served statically from [`public/`](./public).
+

compose.yaml

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+# This compose file shows how to deploy the service in production
+
+name: graddit
+
+services:
+  server:
+    image: ghcr.io/olillin/graddit
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+