[README] Add link to Rapodiff directory

README.md

@@ -118,6 +118,7 @@ Some useful commands are defined in `package.json` and can be run with `npm run
 - `npm run docker:down`: stops the whole environment
 - `npm run testupdater`: runs tests for updater
 - `npm run flushredis`: Clears redis, which forces big calculations to be redone in e.g. studyprogramme overview and faculty views.
+- `npm run rapodiff`: runs [Rapodiff](./services/backend/src/rapodiff/)
 
 Once you have ran setup for oodikone , you can just execute the first one (`npm run oodikone`). After starting and waiting for a while for containers to compile, oodikone can be accessed at [http://localhost:3000/](http://localhost:3000/) and Adminer (database investigation tool) at [http://localhost:5050/](http://localhost:5050/). Adminer requires you to login with username `postgres` and with any password you choose (for example `p`).
 
@@ -172,6 +173,8 @@ Continuous integration (CI) works with Github actions and is defined in workflow
 - Updater is deployed to production when pushed if tests pass
 - Test databases can be updated, instructions in [anonyymioodi README](anonyymioodi/README.md)
 
+[Rapodiff](./services/backend/src/rapodiff/) can be used to check differences between Rapo API and Oodikone data.
+
 ## ❓FAQ
 
 ### Modules are missing after updating package.json