Add community links to readme

Author: adamwathan

README.md

@@ -16,6 +16,16 @@
 
 For full documentation, visit [tailwindcss.com](https://tailwindcss.com/).
 
+## Community
+
+For help, discussion about best practices, or any other conversation that would benefit from being searchable:
+
+[Discuss Tailwind CSS on GitHub](https://github.com/tailwindcss/discuss/issues?q=is%3Aissue+sort%3Aupdated-desc)
+
+For casual chit-chat with others using the framework:
+
+[Join the Tailwind CSS Slack Community](https://join.slack.com/t/tailwindcss/shared_invite/enQtMjc2NTA1NTg0NTEyLTY4ZTg1YWFjM2NjMTRkMmNkMTA4MGNiZTFmNDYyYTJhNjNkY2QxODQwODE4MWRiZDFlNzdmOGI0MmQ1M2EzZmQ)
+
 ## Contributing
 
 If you're interested in contributing to Tailwind CSS, please read our [contributing docs](https://github.com/tailwindcss/tailwindcss/blob/master/.github/CONTRIBUTING.md) **before submitting a pull request**.