Create CONTRIBUTING.Md (#4)

CONTRIBUTING.Md

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+Yes, we need some tests!
+
+## Testing
+Until then, please test out your changes in the [shakacode/bootstrap-loader](https://github.com/shakacode/bootstrap-loader) project in the [bootstrap-loader/examples](https://github.com/shakacode/bootstrap-loader/tree/master/examples).
+
+Please test both the basic and css-modules examples.
+
+For example, look for the "font-awesome-loader" in the
+[examples/basic/package.json](https://github.com/shakacode/bootstrap-loader/blob/master/examples/basic/package.json) file. Test out
+your changes here.
+
+
+When you submit a PR, please write down what you did to manually test this.
+
+## Releasing
+
+I use release-it! (`npm i -g release-it`)
+
+```
+release-it 1.0.0
+```
+
+or for a beta:
+
+```
+release-it 0.0.1-beta.1
+```