Create CONTRIBUTING.md

Author: christopherthielen

CONTRIBUTING.md

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+## Report an Issue
+
+Help us make UI-Router better! If you think you might have found a bug, or some other weirdness, start by making sure
+it hasn't already been reported. You can [search through existing issues](https://github.com/angular-ui/ui-router/search?q=wat%3F&type=Issues)
+to see if someone's reported one similar to yours.
+
+If not, then [create a plunkr](http://plnkr.co/edit/u18KQc?p=preview) that demonstrates the problem (try to use as little code
+as possible: the more minimalist, the faster we can debug it).
+
+Next, [create a new issue](https://github.com/angular-ui/ui-router/issues/new) that briefly explains the problem,
+and provides a bit of background as to the circumstances that triggered it. Don't forget to include the link to
+that plunkr you created!
+
+**Note**: If you're unsure how a feature is used, or are encountering some unexpected behavior that you aren't sure
+is a bug, it's best to talk it out in the
+[Google Group](https://groups.google.com/forum/#!categories/angular-ui/router) or on
+[StackOverflow](http://stackoverflow.com/questions/ask?tags=angularjs,angular-ui-router) before reporting it. This
+keeps development streamlined, and helps us focus on building great software.
+
+Please keep in mind that the issue tracker is for *issues*. Please do *not* post an issue if you need help or support. Instead, see one of the above-mentioned forums or [IRC](irc://irc.freenode.net/#angularjs).
+
+
+## Contribute
+
+**(1)** See the **[Developing](#developing)** section below, to get the development version of UI-Router up and running on your local machine.
+
+**(2)** Check out the [roadmap](https://github.com/angular-ui/ui-router/milestones) to see where the project is headed, and if your feature idea fits with where we're headed.
+
+**(3)** If you're not sure, [open an RFC](https://github.com/angular-ui/ui-router/issues/new?title=RFC:%20My%20idea) to get some feedback on your idea.
+
+**(4)** Finally, commit some code and open a pull request. Code & commits should abide by the following rules:
+
+- *Always* have test coverage for new features (or regression tests for bug fixes), and *never* break existing tests
+- Commits should represent one logical change each; if a feature goes through multiple iterations, squash your commits down to one
+- Make sure to follow the [Angular commit message format](https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit-message-format) so your change will appear in the changelog of the next release.
+- Changes should always respect the coding style of the project
+
+
+
+## Developing
+
+UI-Router uses <code>grunt >= 0.4.x</code>. Make sure to upgrade your environment and read the
+[Migration Guide](http://gruntjs.com/upgrading-from-0.3-to-0.4).
+
+Dependencies for building from source and running tests:
+
+* [grunt-cli](https://github.com/gruntjs/grunt-cli) - run: `$ npm install -g grunt-cli`
+* Then, install the development dependencies by running `$ npm install` from the project directory
+
+There are a number of targets in the gruntfile that are used to generating different builds:
+
+* `grunt`: Perform a normal build, runs jshint and karma tests
+* `grunt build`: Perform a normal build
+* `grunt dist`: Perform a clean build and generate documentation
+* `grunt dev`: Run dev server (sample app) and watch for changes, builds and runs karma tests on changes.