First draft for CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thank you for considering giving feedback or contributing to this project.
+
+There are two ways you can contribute to this repository:
+
+1. **Creating or commenting on issues**: If you spot a mistake or notice inconsistencies, please feel free to create a new issue [here](https://github.com/scunning1975/mixtape/issues). You are also welcome to read through the issues submitted by others and to contribute to the discussion.
+1. **Proposing changes**: If you are familiar with how GitHub works (or are willing to try), you can submit a pull request with any additions or modifications to the files in this repository.
+
+For more details on contributing via GitHub, read through the sections below.
+
+## Contributing through GitHub
+
+To open issues or pull requests, you will need to create an account on <https://github.com/>. For pull request, you will also need to have [set up Git](https://happygitwithr.com/install-git.html) on your local machine.
+
+### Creating or commenting on issues
+
+Issues are places to track ideas, enhancements, tasks, and to report errors or bugs. To create a new issue:
+
+1. Go to [the issues tab](https://github.com/scunning1975/mixtape/issues).
+1. Search the already posted issues to see if the feedback you are about to give is already posted.
+1. If your feedback has not already been brought up, please press the green *New Issue* button to post a new issue.
+
+### Proposing changes via pull requests
+
+Changes or additions to files are made via *pull requests* or PRs. For major changes, please open an issue first to discuss what you would like to change.
+
+To create a pull request, you will need to:
+
+1. Create a [fork of this repository](https://github.com/scunning1975/mixtape/fork). Forking a repository allows you to freely experiment with changes without affecting the original project.
+1. [Clone](https://help.github.com/en/github/creating-cloning-and-archiving-repositories/cloning-a-repository) your fork to your local machine.
+  ```bash
+  git clone https://github.com/<YOUR-GITHUB-USERNAME>/mixtape.git
+  ```
+1. Create and switch to a new branch. Make your changes. Commit, and push.
+  ```bash
+  git checkout -b new-branch
+  # Make your changes
+  git add "file-that-changed.do"
+  git commit -m "The commit message"
+  git push origin new-branch
+  ```
+1. Navigate back to GitHub. You will see a yellow banner near the top of your repository. Click on *Compare & Pull Request*. If your pull request closes an issue, add `Fixes #<ISSUE-NUMBER>` to the body of the PR so the issue is automatically closed once the PR is accepted.

README.md

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 # mixtape
 Data files for Causal Inference: The Mixtape
 
+Contributions are very welcome. You can [read this guide](CONTRIBUTING.md) for more guidance.
+
 Please note that this project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.