Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to oji
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+Please note we have a [code of conduct](https://github.com/xxczaki/oji/blob/master/CODE_OF_CONDUCT.md), please follow it in all your interactions with the project.
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+This section guides you through submitting a bug report for oji. Following these guidelines helps maintainers and the community
+understand your report :pencil:, reproduce the behavior :computer: :computer:, and find related reports :mag_right:.
+
+When you are creating a bug report, explain the problem and include additional details to help maintainers reproduce the problem:
+
+* **Use a clear and descriptive title** for the issue to identify the problem.
+* **Describe the exact steps which reproduce the problem** in as many details as possible.
+* **Include terminal output** with error message.
+* **Which version of Node.js are you using?** You can run `node -v` in your terminal to see the version number.
+* **What's the name and version of the OS you're using**?
+* **Check your grammar**!
+
+> **Note:** If you find a **Closed** issue that seems like it is the same thing that you're experiencing, open a new issue and include a link to the original issue in the body of your new one.
+
+### Adding Enhancements
+
+This section guides you through adding an enhancement for oji, including completely new features and minor
+improvements to existing functionality. Following these guidelines helps maintainers and the community understand your pull request
+:pencil:.
+
+When you are creating a pull request:
+
+* **Use a clear and descriptive title** to identify the enhancement.
+* **Provide a description of the enhancement** in as many details as possible.
+* **Explain why this enhancement would be useful**?
+* **Before submitting a code change, check the code style** by running `npm test`.
+* **Check your grammar**!
+
+