Update README.md to include Docker deployment

README.md

@@ -7,3 +7,15 @@ Updated javascript version of the [old chemistry checker](https://github.com/isa
 Use `yarn dev` or `yarn start` to run the server locally on the port defined in `.env`.
 
 The chemistry checker is available on `/chemistry` and the nuclear checker is available on `/nuclear`. Both have a parser on `./parse` and a checker on `./check`.
+
+# Docker deployment
+
+1. Ensure that [Docker](https://www.docker.com/) is installed
+2. To build, run:
+```
+docker build -t ghcr.io/isaacphysics/chemistry-checker-js:latest --pull .
+```
+3. To deploy to the GitHub Container Registry, run:
+```
+docker push ghcr.io/isaacphysics/chemistry-checker-js:latest
+```