Add note on how to deploy to github packages

Author: David Julia

DEPLOYMENT-GITHUB-PACKAGES.md

@@ -0,0 +1,4 @@
+Use the following command, substituting your github personal access token in for <TOKEN>:
+```../mvnw -s ~/.m2/settings.xml -DskipTests=true -Dregistry=https://maven.pkg.github.com/dajulia3 -Dtoken=<TOKEN> deploy```
+
+Note that the command skips tests so make sure tests pass before running this