Add RELEASING.md. (#153)

Author: songy23

RELEASING.md

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+# Releasing OpenCensus Node Packages (for Maintainers Only)
+
+This document explains how to publish all OC Node modules at version x.y.z. Ensure that you’re following semver when choosing a version number.
+
+## Update to latest locally
+
+Use `git fetch` and `git checkout origin/master` to ensure you’re on the latest commit. Make sure
+you have no unstaged changes. Ideally, also use `git clean -dfx` to remove all ignored and
+untracked files.
+
+## Create a new branch
+
+Create a new branch called `x.y.z-proposal` from the current commit.
+
+## Use Lerna to prepare each package for release
+
+Use `npm install` and `lerna bootstrap` to initialize all package directories.
+Also, use `lerna publish --skip-npm --skip-git` to bump version numbers.
+Ensure that the version being bumped to is `x.y.z`. This should create some unstaged changes.
+
+## Create a new commit
+
+Create a new commit with the exact title: `chore(multiple): x.y.z release proposal`.
+
+## Use the Changelog to create a GitHub Release
+
+On [GitHub Releases](https://github.com/census-instrumentation/opencensus-node/releases),
+follow the example set by recent releases to populate a summary of changes, as well as a list of
+commits that were applied since the last release. `git log --oneline --no-decorate` is a good way
+to get that list of commits. Save it as a draft, don’t publish it. Don’t forget the tag -- call
+it `vx.y.z` and leave it pointing at `master` for now (this can be changed as long as the GitHub
+release isn’t published).
+
+## Create a new PR
+
+Push the branch to GitHub and create a new PR with that exact name. The commit body should just
+be a link to the *draft* notes. Someone who can access draft notes should approve it, looking
+in particular for test passing, and whether the draft notes are satisfactory.
+
+## Merge and pull
+
+Merge the PR, and pull the changes locally (using the commands in the first step). Ensure that
+`chore(multiple): x.y.z release proposal` is the most recent commit.
+
+## Publish all packages
+
+Go into each directory and use `npm publish` to publish the package. You can use the following
+script to automate this.
+
+```bash
+#!/bin/bash
+
+for dir in $(ls packages); do
+ pushd packages/$dir
+ npm publish
+ popd
+done
+```
+
+Check your e-mail and make sure the number of “you’ve published this module” emails matches the number you expect.
+
+## Publish the GitHub Release
+
+Publish the GitHub release, ensuring that the tag points to the newly landed commit corresponding to release proposal `x.y.z`.