add README

README.md

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+toggle_sort_titles plugin
+=========================
+
+Plugin for [Tiny Tiny RSS](https://tt-rss.org/) to add a new hotkey to change
+feed sorting.
+
+
+Installation
+------------
+
+- git clone the repository or download a copy in the plugins.local directory of
+  your tt-rss install.
+- Inside tt-rss, go to Configuration and enable the `toggle_sort_titles` plugin
+
+
+Usage
+-----
+
+Just press `T` to toggle sort order.
+