Update index.md

Author: ivan-hc

index.md

@@ -298,6 +298,7 @@ am -i --user topgrade
   - [Option Three: "Firefox profiles"](https://github.com/ivan-hc/AM/blob/main/docs/guides-and-tutorials/template.md#option-three-firefox-profiles)
   - [How an installation script works](https://github.com/ivan-hc/AM/blob/main/docs/guides-and-tutorials/template.md#how-an-installation-script-works)
   - [How to test an installation script](https://github.com/ivan-hc/AM/blob/main/docs/guides-and-tutorials/template.md#how-to-test-an-installation-script)
+  - [How to submit a Pull Request](https://github.com/ivan-hc/AM/blob/main/docs/guides-and-tutorials/template.md#how-to-submit-a-pull-request)
 - [Third-party databases for applications (NeoDB)](https://github.com/ivan-hc/AM/blob/main/docs/guides-and-tutorials/newrepo.md)
 
 [Instructions for Linux Distro Maintainers](https://github.com/ivan-hc/AM#instructions-for-linux-distro-maintainers)