Document release process.

RELEASING.md

@@ -0,0 +1,19 @@
+Release Process
+===============
+
+ 1.  Ensure `VERSION_NAME` in `gradle.properties` is set to the version you want to release.
+ 2.  Add an entry in `CHANGELOG.md` with the changes for the release.
+ 3.  Update `README.md` with the version about to be released. Also update the RxJava version in
+     this file to its latest.
+ 4.  Update the RxJava version in `rxandroid/build.gradle` to its latest. (We tell people that we
+     won't be tracking RxJava releases, and we don't, but we do it anyway when we are releasing for
+     those who ignore the advice.)
+ 5.  Commit: `git commit -am "Prepare version X.Y.X"`
+ 6.  Tag: `git tag -a X.Y.Z -m "Version X.Y.Z"`
+ 7.  Update `VERSION_NAME` in `gradle.properties` to the next development version. For example, if
+     you just tagged version 1.0.4 you would set this value to 1.0.5. Do NOT append "-SNAPSHOT" to
+     this value, it will be added automatically.
+ 8.  Commit: `git commit -am "Prepare next development version."`
+ 9.  Push: `git push && git push --tags`
+ 10. Paste the `CHANGELOG.md` contents for this version into a Release on GitHub along with the
+     Groovy for depending on the new version (https://github.com/ReactiveX/RxAndroid/releases).