docs(contrib): Added CONTRIBUTING.md

Added basic info for contributors

#83

CONTRIBUTING.md

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+# Contributing to Create Elm App
+
+## Setting Up a Local Copy
+
+1. Fork the repo and clone with `git clone [email protected]:%YOUR_USERNAME%/create-elm-app.git`
+
+2. Run `npm install` in the root `create-elm-app` folder to install all dependencies.
+
+3. Run `npm link` in the root `create-elm-app` folder to install local module globally.
+
+## Submitting a Pull Request
+
+When you have a local copy of the project up and running, create a new branch with a name, such as `patch-1`
+
+```
+git checkout -b patch-1
+```
+
+Create Elm App uses [Commitizen](https://github.com/commitizen/cz-cli) and [semantic-release](https://github.com/semantic-release/semantic-release) for release automatization.
+
+Commit changes by running `npm run commit`
+
+Follow the prompt and try to specify as much information as possible.