Update docs and add final artwork

Author: tonybaloney

README.md

@@ -18,7 +18,7 @@
 [![Visual Studio Marketplace Installs](https://img.shields.io/visual-studio-marketplace/i/tonybaloney.vscode-pets?logo=visualstudio)](https://marketplace.visualstudio.com/items?itemName=tonybaloney.vscode-pets&WT.mc_id=python-17801-anthonyshaw)
 [![Visual Studio Marketplace Downloads](https://img.shields.io/visual-studio-marketplace/d/tonybaloney.vscode-pets?logo=visualstudio)](https://marketplace.visualstudio.com/items?itemName=tonybaloney.vscode-pets&WT.mc_id=python-17801-anthonyshaw)
 
-![screenshot](https://github.com/tonybaloney/vscode-pets/raw/main/docs/source/_static/screenshot.gif)
+![screenshot](https://github.com/tonybaloney/vscode-pets/raw/main/docs/source/_static/winter.gif)
 
 ## Installation
 
@@ -54,6 +54,8 @@ Visit the [Crowdin Project](https://crowdin.com/project/vscode-pets) in case you
 
 The cat animations were designed by [seethingswarm](https://seethingswarm.itch.io/catset). The dog media assets for this extension were designed by [NVPH Studio](https://nvph-studio.itch.io/dog-animation-4-different-dogs). 
 
+The winter theme is original artwork by [Kiana Mosser](https://www.instagram.com/kianamosser/) created for VS Code Pets.
+
 The forest theme was designed by [edermunizz](https://edermunizz.itch.io/free-pixel-art-forest). The castle assets were created using artwork by [GuttyKreum](https://guttykreum.itch.io/gothic-castle-game-assets).
 
 [Marc Duiker](https://twitter.com/marcduiker) created the Clippy, Rocky, Zappy, rubber duck, snake, cockatiel, Ferris the crab, and Mod the dotnet bot media assets.

docs/source/_static/winter-screenshot.png

@@ -142,3 +142,9 @@ Set `vscode-pets.theme` to `"castle"` for them to roam the ramparts!
 Set `vscode-pets.theme` to `"beach"` for your friends to play by the ocean.
 
 .. image:: _static/beach-pose.png
+
+Set ``vscode-pets.theme`` to ``"winter"`` for your pets roam around the snowy mountains.
+
+.. image:: _static/winter.gif
+
+If you find the snowfall too distracting, you can disable special effects in settings.