Add a guide for doing releases

Releases.md

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+The list of releases with notes can be found at:
+https://github.com/facebook/react-native/releases
+
+## Cut a release branch
+
+- Make sure iOS and Android Getting Started flow works on master.
+- Publish to Maven Central:
+  - Edit `ReactAndroid/gradle.properties`
+  - Edit `ReactAndroid/release.gradle` and uncomment Javadoc generation
+  - `./gradlew :ReactAndroid:installArchives` (`java -version` should print 1.7 which is currently needed for Javadoc generation)
+  - Log into Sonatype and go to [Staging upload](https://oss.sonatype.org/#staging-upload)
+  - Select Artifact(s) with a POM (to publish to a local Maven repo for testing run `./gradlew :ReactAndroid:installArchives`)
+  - Add all files: .aar, sources jar, javadoc jar, .asc for everything (including the POM file)
+- `git checkout -b 0.12-stable`
+- In `package.json`, set version to e.g. `0.12.0-rc`.
+- In `React.podspec`, set version to e.g. `0.12.0-rc`.
+- In `local-cli/generator-android/templates/src/app/build.gradle` update the dependency to e.g. `com.facebook.react:react-native:0.12.+`
+- `git push origin 0.12-stable`
+- `npm publish`
+
+## Do a release
+
+To release e.g. 0.12 to npm:
+
+(For admins, here's the command to promote someone)
+
+```
+npm owner add <user> react-native
+```
+
+When you are ready to do a new release.
+
+- Update package.json and React.podspec with the new number
+
+```
+git tag v0.6.0-rc 0.6-stable # don't forget the `v` at the beginning!
+git push --tags
+```
+
+- Publish to GitHub
+
+```
+git push git push origin 0.12-stable
+```
+
+- Publish to npm
+
+```
+npm publish
+npm dist-tag add react-native@0.12.0 latest
+```
+
+- Publish to CocoaPods (it takes several minutes to validate the podspec)
+- Upgrade tags to a release by going to https://github.com/facebook/react-native/tags
+- Click "Add Notes to release"
+- Click Publish