Add contribution guideline

sindresorhus · Sep 5, 2021 · 3dfb58e · 3dfb58e
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 ## Submitting a new type
 
 - One type addition per pull request, unless they are connected.
+- Please help review the other open pull requests. If there are no open pull requests, provide some feedback on some of the open issues.
 - Create a new file in the `test-d` directory and write at least one type test.
 	- See the other tests for inspiration.
 	- If it makes sense, also write a negative test using [`expectError()`](https://github.com/SamVerschueren/tsd#expecterrorfunction).