chore: 📝 document release process (#30)

Author: bastiandoetsch

RELEASE.md

@@ -0,0 +1,15 @@
+# Release
+
+1. [Create release](https://github.com/snyk/code-sdk-java/releases) in github with a new tag vX.X.X for the version
+2. Add changes & fixes to the release information
+3. Wait for the release action to run
+4. Log into [Sonatype](https://oss.sonatype.org)
+5. Click on [Staging Repositories](https://oss.sonatype.org/#)
+6. Select `iosnyk-xxxx`
+7. Click on `Close`
+8. Wait for the Close activity to finish (takes about 10 min)
+9. Select `iosnyk-xxxx` staging repository again
+10. Click on `Release` (takes about 10 min)
+
+See [Staging Overview](https://help.sonatype.com/repomanager2/staging-releases/staging-overview) for 
+some general Sonatype info.