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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.
+
+---
+
+Please ensure your pull request adheres to the following guidelines:
+
+* Search previous suggestions before making a new one, as yours may be a duplicate.
+* Suggested packages should be tested and documented.
+* Make an individual pull request for each suggestion. This can be ignored if packages share common theme or functionality, in that case can be in bulk.
+* Use the following format: ```[PACKAGE](LINK) - DESCRIPTION.```
+* New categories, or improvements to the existing categorization are welcome.
+* Keep descriptions short and simple, but descriptive.
+* End all descriptions with a full stop/period.
+* Check your spelling and grammar.
+* Make sure your text editor is set to remove trailing whitespace.
+
+Thank you for your suggestions!
+
+## 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. There's no need to open a new PR, just edit
+the existing one. 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.