[Documentation]: Add CONTRIBUTING.md to ease and explain contribution…

… guidelines. (#116)

* [Documentation]: Add CONTRIBUTING.md to ease and explain contribution guidelines

* Update CONTRIBUTING.md with lenient commit rules

CONTRIBUTING.md

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+# Contributing to neutralinojs-cli
+
+First off, kudos for taking the time to contribute! :tada::+1:
+
+The following is a set of guidelines for contributing to neutralinojs-cli, which is hosted as a part of [Neutralinojs](https://github.com/neutralinojs) on GitHub. These are mostly guidelines, not rules. Use your best judgment, and feel free to propose changes to this document in a pull request.
+
+## Table Of Contents
+
+- [Code of Conduct](#code-of-conduct)
+- [Making a PR](#making-a-pr)
+
+## Code of Conduct
+
+This project encourages each and everyone to contribute to it. By participating, you are expected to uphold the spirits of open source culture.
+
+## Making a PR
+
+1. Fork the latest state of the repo using git.
+2. Clone the forked repo and pull it to have latest code locally. Also, add a Git remote for the original repository.
+3. Create a feature branch in which you place your changes. Make sure all your code changes are made in your respective branch.
+4. Add proper commit messages to help others understand what you are trying to implement via your branch. Refer [this](https://www.conventionalcommits.org/en/v1.0.0/) for reference.
+5. Push the branch to GitHub. Open a pull request from the new branch to the original repo. Clean up after your pull request is merged.
+6. Once everything is reviewed, your PR will be merged. Congratulations :tada::tada: The Neutralinojs team thanks you :sparkles: Hope to send you more such :sparkles: