fixes #252: missing contributing.md

CONTRIBUTING.md

@@ -0,0 +1,60 @@
+# Welcome!
+:heart: Thanks for your interest and time in contributing to this project.
+
+## What We Use
+
+- Building: [Webpack](https://webpack.js.org)
+- Linting: [ESLint](http://eslint.org/)
+- NPM: [NPM as a Build Tool](https://css-tricks.com/using-npm-build-tool/)
+- Testing: [Mocha](https://mochajs.org)
+
+## Forking and Cloning
+
+You'll need to first fork this repository, and then clone it locally before you
+can submit a Pull Request with your proposed changes.
+
+Please see the following articles for help getting started with git:
+
+[Forking a Repository](https://help.github.com/articles/fork-a-repo/)
+[Cloning a Repository](https://help.github.com/articles/cloning-a-repository/)
+
+## Pull Requests
+
+Please lint and test your changes before submitting a Pull Request. You can lint your
+changes by running:
+
+```console
+$ npm run lint
+```
+
+You can test your changes against the test suite for this module by running:
+
+```console
+$ npm run test
+```
+
+_Note: Please avoid committing `package-lock.json` files!_
+
+Please don't change variable or parameter names to match your personal
+preferences, unless the change is part of a refactor or significant modification
+of the codebase (which is very rare).
+
+Please remember to thoroughly explain your Pull Request if it doesn't have an
+associated issue. If you're changing code significantly, please remember to add
+inline or block comments in the code as appropriate.
+
+## Testing Your Pull Request
+
+You may have the need to test your changes in a real-world project or dependent
+module. Thankfully, Github provides a means to do this. Add a dependency to the
+`package.json` for such a project as follows:
+
+```json
+"webpack-dev-middleware": "webpack/webpack-dev-middleware#{id}/head"
+```
+
+Where `{id}` is the # ID of your Pull Request.
+
+## Thanks
+
+For your interest, time, understanding, and for following this simple guide.