Adding CONTRIBUTING.md

CONTRIBUTING.md

+# Contributing
+
+### Code Style
+
+Please follow the [node style guide](https://github.com/felixge/node-style-guide).
+
+### Commit Messages
+
+Commit messages should be verb based.
+
+- `Fixing ...`
+- `Adding ...`
+- `Updating ...`
+- `Removing ...`
+
+### Testing
+
+Please update the tests to reflect your code changes. Pull requests will not be accepted if they are failing on [Travis CI](https://travis-ci.org/mzabriskie/axios).
+
+### Documentation
+
+Please update the docs accordingly so that there are no discrepencies between the API and the documentation.
+
+### Developing
+
+- `grunt test` run the jasmine and nodeunit tests
+- `grunt build` run webpack and bundle the source
+- `grunt publish` prepare the code for release
+- `grunt watch:test` watch for changes and run `test`
+- `grunt watch:build` watch for changes and run `build`
+
+Please don't include changes to `dist/` in your pull request. This should only be updated when releasing a new version.
+
+### Running Examples
+
+Examples are included in part to allow manual testing.
+
+Running example
+
+```bash
+$ npm install -g http-server
+$ http-server
+# Open 127.0.0.1:8080/example
+```
+
+Running sandbox in browser
+
+```bash
+$ npm start
+# Open 127.0.0.1:3000
+```
+
+Running sandbox in terminal
+
+```bash
+$ npm start
+$ node ./sandbox/client
+```
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