Add a CONTRIBUTING.md and PULL_REQUEST_TEMPLATE.md

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+# 0x.js CONTRIBUTING.md
+
+Thank you for your interest in contributing to 0x.js! We welcome contributions from anyone on the internet, and are grateful for even the smallest of fixes!
+
+## Developer's guide
+
+## How to contribute
+
+If you'd like to contribute to 0x.js, please fork the repo, fix, commit and send a pull request against the `development` branch for the maintainers to review and merge into the main code base. If you wish to submit more complex changes though, please check up with a core dev first on [our gitter channel](https://gitter.im/0xProject/Lobby) or  in the `#dev` channel on our [slack](https://slack.0xproject.com/) to ensure those changes are in line with the general philosophy of the project and/or to get some early feedback which can make both your efforts easier as well as our review and merge procedures quick and simple.
+
+We encourage a “PR early” approach so create the PR as early as possible even without the fix/feature ready, so that devs and other volunteers know you have picked up the issue. These early PRs should indicate an 'in progress' status by adding the '[WIP]' prefix to the PR title. Please make sure your contributions adhere to our coding guidelines:
+
+* Pull requests adding features or refactoring should be opened against the `development` branch
+* Pull requests fixing bugs in the latest release version should be opened again the `master` branch
+* Write [good commit messages](https://chris.beams.io/posts/git-commit/)
+
+## Code quality
+
+Because 0x.js is used by multiple relayers in production and their businesses depend on it, we strive for excellent code quality. Please follow the existing code standards and conventions. `tslint` (described below) will help you.
+If you're adding functionality, please also add tests and make sure they pass. We have an automatic coverage reporting tool, so we'll see it if they are missing ;)
+If you're adding a new public function/member, make sure you document it with Java doc-style comments. We use typedoc to generate [awesome documentation](https://0xproject.com/docs/0xjs) from the comments within our source code.
+
+## Running and building
+
+First thing to do with an unknown code base is to run the tests.
+We assume that you have `npm` and `yarn` installed.
+
+To do that:
+
+* Install dependencies: `yarn`
+* Initialize the testrpc state (migrate the contracts) by doing one of the following:
+    * Manual contracts migration:
+        * Run testrpc: `yarn testrpc`
+        * Clone the `[contracts](https://github.com/0xProject/contracts)` repo and run `yarn migrate`
+    * Use one of the existing testrpc snapshots
+        * Check out `circle.yml` for an example
+* Run tests: `yarn test`
+
+To build run: `yarn build`
+
+We also recommend you read through the tests.
+
+## Styleguide
+
+We use `[tslint](https://palantir.github.io/tslint/)` with [custom configs](https://github.com/0xProject/tslint-config-0xproject) to keep our code style consistent.
+
+To lint your code just run: `yarn lint`
+
+If using the Atom text editor, we recommend you install the following packages:
+
+* [atom-typescript](https://atom.io/packages/atom-typescript)
+* [linter-tslint](https://atom.io/packages/linter-tslint)
+
+Our CI will also run it as a part of the test run when you submit your PR.
+
+
+## Branch structure & versioning
+
+We use [semantic versioning](http://semver.org/), but before we reach v1.0.0 all breaking changes as well as new features will be minor version bumps.
+
+We have two main branches: `master` and `development`.
+
+`master` represents the most recent released (published on npm) version.
+
+`development` represents the development state and is a default branch to which you will submit a PR. We use this structure so that we can push hotfixes to the currently released version without needing to publish all the changes made towards the next release. If a hotfix is implemented on `master`, it is back-ported to `development`.
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+This PR:
+*