Add instructions so I can remember next time

changes.md

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+#Making changes to Quartz Monitor
+
+* Increment version number in build.gradle and add -SNAPSHOT (whilst working on it)
+* Make changes
+* run `gradle install` to install snapshot version to local maven
+* go to one of the test projects, e.g. `cd src/test/projects/test-harness`
+* run `gradle run`
+* open [quartz monitor page](http://localhost:8080/quartz/list) and make sure jobs are running correctly and the failing job is reported as such
+* If everything is ok remove the -SNAPSHOT, commit, tag it (following convention) and push
+* run the bintray-setup commands after editing the api-key that can be found [here](https://bintray.com/profile/edit) > API Key (sign in using github)
+* publish by running `gradle bintrayUpload`
+* request it's added to https://bintray.com/grails/plugins - or maybe it can be linked after the first time?