Adding timetracking to feature list

Time tracking should be added to feature-list until the PR (go-gitea/gitea#2210) is merged or the release with this feature is released.

Author: jonasfranz

content/page/index.en-us.md

@@ -181,6 +181,7 @@ The goal of this project is to make the easiest, fastest, and most painless way
         - Milestones
         - Labels
         - Assign issues
+        - Track time
         - Filter
             - Open
             - Closed