Document the release process

RELEASE.md

@@ -0,0 +1,34 @@
+Release process
+---------------
+
+* Update the version of the Maven artifacts:
+
+      mvn versions:set -DnewVersion=x.y -DgenerateBackupPoms=false
+
+* Update the release date in README.md
+
+* Upload the Maven artifacts to Nexus:
+
+      mvn clean deploy -Prelease
+
+* Login to https://oss.sonatype.org and release the Nexus staging repository
+
+* Review and commit the changes
+
+* Tag the release:
+
+      git tag x.y
+
+* Create a release on GitHub, and upload the all-in-one jar and the DEB and RPM packages
+
+* Close the current milestone on GitHub and create a new one
+
+* Publish the release on Chocolatey (see `jsign/src/choco/README.md`)
+
+* Update the Maven version to the next snapshot:
+
+      mvn versions:set -DnewVersion=x.y+1-SNAPSHOT -DgenerateBackupPoms=false
+
+* Commit and push the changes
+
+* Announce the release and celebrate!