docs: update dev instructions

Author: soedirgo

README.md

@@ -92,9 +92,9 @@ None. Please don't use this as a standalone server. This should be used behind a
 
 ## Developers
 
-1. Start the database using `docker-compose -f test/db/docker-compose.yml up`
-2. Run `npm run dev`
-3. Run `npm test` while you work
+To start developing, run `npm run dev`. It will set up the database with Docker for you. The server will restart on file change.
+
+To test your changes, run `npm run test`. To review your changes, add the `-u/--updateSnapshot` flag to `jest` on the `test:run` script, run `npm run test`, and then review the git diff of the snapshots. Don't forget to remove the `-u/--updateSnapshot` flag when committing.
 
 ## Licence