Rename contributing.md to Contributing.md

Contributing.md

@@ -0,0 +1,25 @@
+# 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:
+
+- Include a description of the link you're adding if possible
+- If you're changing section headers, ensure you update the contents at the top too
+- If you're adding a new section, ensure you give it a unique name
+
+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.