Create CONTRIBUTING.md

Author: mhutchie

CONTRIBUTING.md

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+# Contributing to Git Graph
+
+Thank you for taking the time to contribute!
+
+The following are a set of guidelines for contributing to vscode-git-graph.
+
+## Code of Conduct
+
+This project and everyone participating in it is governed by the [Git Graph Code of Conduct](CODE_OF_CONDUCT.md). By participating, you are expected to uphold this code. Please report unacceptable behavior to [mhutchie@16right.com](mailto:mhutchie@16right.com).
+
+## How Can I Contribute?
+
+### Reporting Bugs
+
+Raise a bug you've found to help us improve! Due to the extremely broad nature of Git repositories, some bugs might slip through the cracks.
+
+Check the [open bugs](https://github.com/mhutchie/vscode-git-graph/issues?q=is%3Aissue+is%3Aopen+label%3A"bugs"), and bugs ready for release on the [project board](https://github.com/mhutchie/vscode-git-graph/projects/1#column-4514040) to see if it is already in the process of being resolved. If it is, give the issue a thumbs up, and help provide additional context if the issue author was unable to provide some details.
+
+If the bug hasn't previously been reported, please follow these steps:
+1. Raise an issue by selecting the "Bug Report" template on [this page](https://github.com/mhutchie/vscode-git-graph/issues/new/choose).
+2. Follow the template as you see appropriate, it's only meant to be a guide.
+3. Click "Submit new issue"
+
+We aim to respond promptly, and get it resolved as quickly as possible.
+
+### Feature Suggestions
+
+Suggest an idea for this extension! We want to make Git Graph an even more useful tool in Visual Studio Code, so any suggestions you have are greatly appreciated.
+
+Check the [open feature requests](https://github.com/mhutchie/vscode-git-graph/issues?q=is%3Aissue+is%3Aopen+label%3A"feature+request"), and feature requests ready for release on the [project board](https://github.com/mhutchie/vscode-git-graph/projects/1#column-4514040) to see if your idea is already under consideration or on its way. If it is, give the issue a thumbs up so it will be higher prioritsed.
+
+If your feature hasn't previously been suggested, please follow these steps:
+1. Raise an issue by selecting the "Feature Request" template on [this page](https://github.com/mhutchie/vscode-git-graph/issues/new/choose).
+2. Follow the template as you see appropriate, it's only meant to be a guide.
+3. Click "Submit new issue"
+
+We aim to respond promptly, and prioritise it as we and the community see appropriate.
+
+### Contributing To Development
+
+If you're interested in helping contribute, find an open issue you'd like to work on and comment on it.
+
+To set up your development environment, please follow these steps:
+1. Clone the repo
+2. Open the repo in Visual Studio Code
+3. In the terminal, run `npm run install` to download the required dependencies
+4. Install the tslint extension if it is not already installed
+5. Create and checkout a branch for the issue you're going to work on
+
+The npm scripts are as follows:
+`npm run compile` compiles both front and backend code
+`npm run compile-src` compiles the backend code only
+`npm run compile-web` compiles the frontend code only
+
+Raise a pull request once you've completed development, we'll have a look at it.
+
+#### Style Guide
+
+The required style is produced by running "Format Document" in Visual Studio Code.