updated README with screenshots and promo images

.gitignore

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 assets
-config
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 # Created by https://www.gitignore.io/api/osx

README.md

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 [![Animation Showcase](https://img.youtube.com/vi/P3UX2pdzZdk/default.jpg)](https://youtu.be/P3UX2pdzZdk)
 
+## Gallery
+
+#### App banners for the Pebble featured section
+![Banner Pebble Time Round](images/banner_squared_chalk.jpg)
+
+![Banner Pebble Time](images/banner_squared_basalt.jpg)
+
+![Banner Pebble Steel](images/banner_squared_aplite.jpg)
+
+#### Official Pebble promo shot for the Pebble website
+![Pebble Official Promo Shot](images/pebble-promo-shot.jpeg)
+
+#### Showcase of some color options
+![Color Demo](images/colors_squared_chalk.jpg)
+
+#### Settings page automatically showing the correct frame for the connected model and colorway
+![Settings Demo](images/settings_squared_4.7.jpg)
+
+#### Own promo photo of Squared 4.0 on the Pebble Time Round
+![Pebble Time Round Promo](images/promo-ptr.jpg)
+
 ## Other Platforms
 [Fitbit Versa](https://git.broken.graphics/alina/fitbit-squared)