content: Update README

Author: Sketch Developer

README.md

@@ -20,6 +20,7 @@ A list of Sketch plugins hosted at GitHub, in alphabetical order.
 - [Dockpreview](https://github.com/fnky/sketch-dockpreview), by Christian Petersen: A Sketch plugin that lets you preview your current artboard in the Dock.
 - [Easy Code](https://github.com/luchaoqun125/sketch-version/), by luchaoqun125: easy code
 - [Ephoto Dam](https://guides.addons.ephoto-dam.com/sketch/), by Einden: Integrate your Ephoto Dam on Sketch to import and export media.
+- [Flow Plugin](https://github.com/heshamCO/flow-plugin), by Hesham: Sketch plugin for Flow design handoff – publish designs with full prototype flows for developer inspection
 - [Frontify Plugin](https://github.com/Frontify/sketch), by Frontify: Connecting your brand and design worlds
 - [GxDesignOps](https://github.com/genexuslabs/sketchdesignops), by Gastón Milano: Sketch Plugin For GeneXus internal use
 - [killswitch](https://github.com/madebysnacks/killswitch), by Snacks Studio: A simple Sketch plugin for disabling Symbol overrides.