Add commands to cors_proxy/

cors_proxy/README.md

@@ -3,3 +3,6 @@ this exists because it is very annoying to deal with cors while developing
 I need to deal with cors because i want to test the website on my mobile phone and tablet while running the dev server on my computer
 
 adding the local ip to the allow cors header did not work.
+
+Run this proxy with `docker compose up --build`, run the dev server with `NEXT_PUBLIC_API_URL_PREFIX=origin npm run dev`
+Website should now be reachable at `http://localhost:7000/`
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