📝 Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thank you for wishing to collaborate to the wretch library !
+
+**Ideas, feedback and help are more than welcome.**
+
+## How to
+
+### 1 - Clone the project
+
+```bash
+git clone https://github.com/elbywan/wretch
+cd wretch
+```
+
+### 2 - Install dependencies
+
+```bash
+npm install
+```
+
+### 3 - Change the code as you see fit
+
+### 4 - Lint, Build and Test
+
+```bash
+npm start
+```
+
+The code **must** pass the linter and test checks.
+
+If you add a new functionality, please write some tests !
+
+If a linter rule which is not already set in the tslint.json file is bothering you, feel free to change it.
+
+### 5 - Commit & Pull request
+
+If the modification is related to an existing issue, please mention the number in the commit message. (for instance: `closes #10`)
+
+Always rebase your branch on top of the origin/master branch.