Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+We are open to, and grateful for, any contributions made by the community. By contributing to axios, you agree to abide by the [code of conduct](https://github.com/axios/axios/blob/master/CODE_OF_CONDUCT.md).
+
+## Code Style
+
+Please follow the [node style guide](https://github.com/felixge/node-style-guide).
+
+## Commit Messages
+
+Please follow [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/)
+
+## Documentation
+
+Please update the [docs](README.md) accordingly so that there are no discrepancies between the API and the documentation.
+
+## Running Examples
+
+> Inside the root directory project
+
+1. Switch to the directory `example/`
+2. `yarn install` or `npm install`
+3. `yarn run start` or `npm run-script start`