docs: 📝 add usage and build instructions

- Add instructions for running the application using the prebuilt image with docker-compose.
- Add instructions for building the image locally.
- Include details on configuring environment variables within the docker-compose file.

README.md

@@ -0,0 +1,15 @@
+# Usage (production)
+If you are using the prebuilt image only `docker-compose.yml` is needed. Just configure the enviroment variables as described in the `docker-compose.yml` file and run with:
+```bash
+docker-compose up -d
+```
+If you are not using the prebuilt image, clone the project and run `docker-compose up -d` (comment image and uncomment build in `docker-compose.yml`)
+
+# Build
+Build the image with:
+```bash
+docker build -t d4science/website .
+```
+
+# Usage (development)
+Just run `docker-compose -f docker-compose.dev.yml up -d`