Add CONTRIBUTING.md

Author: ellbee

CONTRIBUTING.md

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+# Contributing
+We are open to, and grateful for, any contributions made by the community.  By contributing to React Redux, you agree to abide by the [code of conduct](https://github.com/rackt/react-redux/blob/master/CODE_OF_CONDUCT.md).
+
+## Reporting Issues and Asking Questions
+Before opening an issue, please search the [issue tracker](https://github.com/rackt/react-redux/issues) to make sure your issue hasn't already been reported.
+
+Please ask any general and implementation specific questions on [Stack Overflow with a Redux tag](http://stackoverflow.com/questions/tagged/redux?sort=votes&pageSize=50) for support.
+
+## Development
+
+Visit the [Issue tracker](https://github.com/rackt/react-redux/issues) to find a list of open issues that need attention.
+
+Fork, then clone the repo:
+```
+git clone https://github.com/your-username/react-redux.git
+```
+
+### Building
+
+Running the `build` task will create both a CommonJS module-per-module build and a UMD build.
+```
+npm run build
+```
+
+To create just a CommonJS module-per-module build:
+```
+npm run build:lib
+```
+
+To create just a UMD build:
+```
+npm run build:umd
+npm run build:umd:min
+```
+
+### Testing and Linting
+
+To run the tests:
+```
+npm run test
+```
+
+To continuously watch and run tests, run the following:
+```
+npm run test:watch
+```
+
+To perform linting with `eslint`, run the following:
+```
+npm run lint
+```
+
+###New Features
+
+Please open an issue with a proposal for a new feature or refactoring before starting on the work. We don't want you to waste your efforts on a pull request that we won't want to accept.
+
+###Style
+
+[rackt](https://github.com/rackt) is trying to keep a standard style across its various projects, which can be found over in [eslint-config-rackt](https://github.com/rackt/eslint-config-rackt). If you have a style change proposal, it should first be proposed there. If accepted, we will be happy to accept a PR to implement it here.
+
+## Submitting Changes
+
+* Open a new issue in the [Issue tracker](https://github.com/rackt/react-redux/issues).
+* Fork the repo.
+* Create a new feature branch based off the `master` branch.
+* Make sure all tests pass and there are no linting errors.
+* Submit a pull request, referencing any issues it addresses.
+
+Please try to keep your pull request focused in scope and avoid including unrelated commits.
+
+After you have submitted your pull request, we'll try to get back to you as soon as possible. We may suggest some changes or improvements.
+
+Thank you for contributing!