Add PUBLISHING.md

Author: gpahal

PUBLISHING.md

@@ -0,0 +1,14 @@
+## Publishing to npm
+
+This document contains instructions to publish dgraph-js to [npm].
+
+[npm]: https://www.npmjs.com/
+
+### Before deploying
+* Get access to credentials for Dgraph's account on npm with username dgraph-io
+* Run `npm login` to login to this account
+
+### Deploying
+* Build and test the code that needs to be published
+* Bump version by modifying the `version` field in `package.json` file
+* Run `npm publish` (for a beta release run `npm publish --tag beta`)