Docs: Update README (#49)

Added a link to create a pull request

Co-authored-by: J-Ha <5481259+jhaaaa@users.noreply.github.com>

README.md

@@ -10,8 +10,8 @@ You can contribute by submitting:
 
 - A [bug report](https://github.com/xmtp/docs-xmtp-org/issues/new?assignees=jhaaaa&labels=bug%2C+documentation&projects=&template=bug_report.md&title=)
 - A [feature request](https://github.com/xmtp/docs-xmtp-org/issues/new?assignees=jhaaaa&labels=documentation%2C+enhancement&projects=&template=feature_request.md&title=)
-- A pull request
-
+- A [pull request](https://github.com/xmtp/docs-xmtp-org/pulls)
+  
 If you submit a pull request (PR), include a link to the bug report or feature request your PR addresses. If a documentation issue doesn't exist, please [open one](https://github.com/xmtp/docs-xmtp-org/issues) before you start contributing.
 
 Have a question about contributing? Post to the [XMTP Help & Resources forum](https://community.xmtp.org/c/help/9).