Merge pull request oxen-io#2607 from yougotwill/theme_doc

Themes documentation

Author: Bilb

THEMES.md

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+# Themes
+
+## Available Themes
+
+- Classic Dark (Default)
+- Classic Light
+- Ocean Light
+- Ocean Dark
+
+## Available Primary (Accent) Colors
+
+- Green `#31F196` <img src="https://placehold.co/15x15/31F196/31F196.png" alt="#31F196" />
+- Blue `#57C9FA` <img src="https://placehold.co/15x15/57C9FA/57C9FA.png" alt="#57C9FA" />
+- Yellow `#FAD657` <img src="https://placehold.co/15x15/FAD657/FAD657.png" alt="#FAD657" />
+- Pink `#FF95EF` <img src="https://placehold.co/15x15/FF95EF/FF95EF.png" alt="#FF95EF" />
+- Purple `#C993FF` <img src="https://placehold.co/15x15/C993FF/C993FF.png" alt="#C993FF" />
+- Orange `#FCB159` <img src="https://placehold.co/15x15/FCB159/FCB159.png" alt="#FCB159" />
+- Red `#FF9C8E` <img src="https://placehold.co/15x15/FF9C8E/FF9C8E.png" alt="#FF9C8E" />
+
+## Custom Theming
+
+Session doesn't support custom theming yet but it's pretty easy to add a new theme file and build it yourself!
+
+[Here](https://github.com/yougotwill/session-desktop/pull/19) is an example PR for the `Windows Crash` theme which was inspired by the classic [blue screen of death](https://user-images.githubusercontent.com/14887287/203880658-e4a768d7-1b25-45d2-9e6d-00b233eb84a8.png).
+
+Keep in mind that if you swap back to the latest `clearnet` with the `Windows Crash` theme set it may cause a database issue. So when you change your branch back make sure to set your theme to one of the [available themes](#available-themes) above.
+
+### Screenshot
+
+<img width="689px" alt="windows crash theme screenshot" src="https://user-images.githubusercontent.com/14887287/203880797-43c2af93-4a1a-4924-bc3c-f269b8784cd2.png">