diff --git a/contributing.md b/contributing.md
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+# Contribution Guidelines
+
+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.
+
+---
+
+Ensure your pull request adheres to the following guidelines:
+
+- **The submitted project should be more than 30 days old.**
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Make an individual pull request for each suggestion.
+- Adhere to the format followed in the list
+- Additions should be added to the bottom of the relevant category for paid software, and at the bottom of the free part of the category for free or open source software.
+- Keep descriptions short and simple, but descriptive.
+- Don't start the description with `A` or `An`.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- The pull request should have a useful title and include a link to the project and why it should be included.
+- New categories or improvements to the existing categorization are welcome, but should be done in a separate pull request.
+
+Thank you for your suggestion!
+
+### Updating your PR
+
+A lot of times, making a PR adhere to the standards above can be difficult. If the maintainers notice anything that we'd like changed, we'll ask you to edit your PR before we merge it. If you're not sure how to do that, [here is a guide](https://github.com/RichardLitt/knowledge/blob/master/github/amending-a-commit-guide.md) on the different ways you can update your PR so that we can merge it.
diff --git a/license b/license
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+CC0 1.0 Universal
+
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