content: Update README

Author: Sketch Developer

README.md

@@ -27,6 +27,7 @@ A list of Sketch plugins hosted at GitHub, in alphabetical order.
 - [Merge Duplicate Symbols](https://github.com/oodesign/merge-duplicate-symbols), by oodesign: Merge symbols or styles, replacing all instances and keeping overrides.
 - [Mesh Gradients](https://github.com/oodesign/mesh-gradients), by oodesign: Create awesome mesh gradients, right inside of Sketch.
 - [Miro Plugin for Sketch](https://github.com/miroapp/sketch_plugin), by Miro: Add, share and discuss your Sketch artboards with the team in Miro. The plugin allow to sync the artboards with the boards in one click
+- [Mockuuups Studio](https://mockuuups.studio/sketch/), by Mockuuups: Easily create beautiful mockups from your Sketch files
 - [Overrides Manager](https://github.com/ozgurgunes/Sketch-Overrides-Manager), by Ozgur Gunes: A Sketch plugin which makes managing overrides easier.
 - [Palette Stripes](https://github.com/sureskumar/palette-stripes), by Sures Kumar: Generate palette stripes in sketch from shape fills.
 - [Phosphor Icons](https://phosphoricons.com), by Tobias Fried: A flexible icon family for interfaces, diagrams, presentations — whatever, really.
@@ -61,6 +62,7 @@ A list of Sketch plugins hosted at GitHub, in alphabetical order.
 
 ## Sorted by last update (newest on top)
 
+- [Mockuuups Studio](https://mockuuups.studio/sketch/), by Mockuuups: Easily create beautiful mockups from your Sketch files
 - [UI Color Palette /one・wcag Color Palette Manager for Apps & Websites](https://uicp.ylb.lt/website), by Aurélien Grimaud: Color Palettes that meet WCAG Guidelines and Operations
 - [🧭 Component Browser](https://github.com/funk4d/Component-Browser-Sketch-Plugin), by Dmytro Shevchuk: Must-have for design systems. The symbol picker that actually works.
 - [Frontify Plugin](https://github.com/Frontify/sketch), by Frontify: Connecting your brand and design worlds