polish readme/changelog

Author: Stephan Dilly

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+
+![](assets/light-theme.png)
+
 ### Added
 - support color themes and light mode [[@MCord](https://github.com/MCord)] ([#28](https://github.com/extrawurst/gitui/issues/28))
 

README.md

@@ -82,10 +82,10 @@ this will log to:
 
 # color theme
 
-to change the colors of the program you have to modify `theme.ron` file
-[Ron format](https://github.com/ron-rs/ron) located at config path (same as log paths). the list of valid 
-colors can be found in [ColorDef](./src/ui/style.rs#ColorDef) struct. note that rgb colors might not be available 
-on some platforms.
+![](assets/light-theme.png)
+
+In general `gitui` should automatically work on `dark` and `light` terminal themes.
+However you can customize everything to your liking: [see THEMES.md](THEMES.md)
 
 # inspiration
 

THEMES.md

@@ -0,0 +1,10 @@
+# Themes 
+
+default on light terminal:
+![](assets/light-theme.png)
+
+to change the colors of the program you have to modify `theme.ron` file
+[Ron format](https://github.com/ron-rs/ron) located at config path (same as log paths). the list of valid 
+
+Valid colors can be found in [ColorDef](./src/ui/style.rs#ColorDef) struct. note that rgb colors might not be supported 
+in every terminal.