docs: Add COC

CONTRIBUTING.md

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+Sure! Here's the modified contribution guide for the repository [OpenSource-API](https://github.com/Pradumnasaraf/candy):
+
+> IMPORTANT **Note**
+>
+> **Pull Requests having no issue associated with them will not be accepted. Firstly get an issue assigned, whether it's already opened or raised by you, and then create a Pull Request.**
+
+## 👨‍💻 Prerequisite
+
+#### Documentation
+
+- [Git](https://git-scm.com/)
+- [Markdown](https://www.markdownguide.org/basic-syntax/)
+
+#### Code
+
+- [Golang](https://golang.org/)
+- [Cobra](https://github.com/spf13/cobra)
+- [Viper](https://github.com/spf13/viper)
+
+## 💥 How to Contribute
+
+- Look at the existing [**Issues**](https://github.com/Pradumnasaraf/candy/issues) or [**create a new issue**](https://github.com/Pradumnasaraf/candy/issues/new/choose)!
+- [**Fork the Repo**](https://github.com/Pradumnasaraf/candy/fork). Then, create a branch for any issue that you are working on. Finally, commit your work.
+- Create a **[Pull Request](https://github.com/Pradumnasaraf/candy/compare)** (_PR_), which will be promptly reviewed and given suggestions for improvements by the community.
+- Add screenshots or screen captures to your Pull Request to help us understand the effects of the changes proposed in your PR.
+
+Please note that the above instructions assume familiarity with Git, Markdown, Node.js, and NPM. If you need any assistance or have further questions, feel free to ask. Happy contributing!