Initial draft for contributing to GD. Need much more explanations, for tests writing (maybe separate doc), etc

CONTRIBUTING.md

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+# Contributing to Atom
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+#### Table Of Contents
+
+[What should I know before I get started?](#what-should-i-know-before-i-get-started)
+  * [Code of Conduct](#code-of-conduct)
+  * [Repositories](#Repositories)
+
+[How Can I Contribute?](#how-can-i-contribute)
+  * [Reporting Bugs](#reporting-bugs)
+  * [Suggesting Enhancements](#suggesting-enhancements)
+  * [Your First Code Contribution](#your-first-code-contribution)
+  * [Pull Requests](#pull-requests)
+
+[Styleguides](#styleguides)
+  * [Git Commit Messages](#git-commit-messages)
+  * [CoffeeScript Styleguide](#coffeescript-styleguide)
+  * [Specs Styleguide](#specs-styleguide)
+  * [Documentation Styleguide](#documentation-styleguide)
+  
+  
+## What should I know before I get started?
+
+### Code of Conduct
+
+This project adheres to the Contributor Covenant [code of conduct](CODE_OF_CONDUCT.md).
+By participating, you are expected to uphold this code.
+Please report unacceptable behavior to [security@libg.org](mailto:security@libgd.org).
+
+### Repositories
+
+* [The main libGD repository](https://github.com/libgd/libgd) for the library and utilities released as part of libgd
+* [The libgd website repository](https://github.com/libgd/website) for the libgd.org website
+* [The Pango support for libgd repository](https://github.com/libgd/gd-pango) for the for libGD Pango support
+
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+This section guides you through submitting a bug report for Atom. Following these guidelines helps maintainers and the community understand your report :pencil:, reproduce the behavior :computer: :computer:, and find related reports :mag_right:.
+
+Before creating bug reports, please check [this list](#before-submitting-a-bug-report) as you might find out that you don't need to create one. When you are creating a bug report, please [include as many details as possible](#how-do-i-submit-a-good-bug-report). If you'd like, you can use [this template](#template-for-submitting-bug-reports) to structure the information.
+
+#### Before Submitting A Bug Report
+
+* **Determine [which repository the problem should be reported in](#atom-and-packages)**.
+* **Perform a [cursory search](https://github.com/issues?q=+is%3Aissue+user%3Alibgd)** to see if the problem has already been reported. If it has, add a comment to the existing issue instead of opening a new one.
+
+#### How Do I Submit A (Good) Bug Report?
+
+For security related bugs, github does not support private issues, that's why we have to handle security issues outside the issues tracker for now. Please drop a mail to [security@libg.org](mailto:security@libgd.org). 
+
+Bugs are tracked as [GitHub issues](https://guides.github.com/features/issues/). After you've determined [which repository](#repositories) your bug is related to, create an issue on that repository and provide the following information.
+
+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.
+* **Provide specific examples to demonstrate the steps**. Include links to files or GitHub projects, or copy/pasteable workable example (for example see [this simple test case](https://github.com/libgd/libgd/blob/master/tests/gd/gd_null.c), which you use in those examples. If you're providing snippets in the issue, use [Markdown code blocks](https://help.github.com/articles/markdown-basics/#multiple-lines).
+* **Describe the behavior you observed after following the steps** and point out what exactly is the problem with that behavior.
+* **Explain which behavior you expected to see instead and why.**
+* **Include images, expected and result images** which show you following the described steps and clearly demonstrate the problem.
+* **If you're reporting that libGD crashed**, include a crash report with a stack trace from the operating system. Include the crash report in the issue in a [code block](https://help.github.com/articles/markdown-basics/#multiple-lines), a [file attachment](https://help.github.com/articles/file-attachments-on-issues-and-pull-requests/), or put it in a [gist](https://gist.github.com/) and provide link to that gist.