Update README.md

Author: KarmaDeb

README.md

@@ -1,2 +1,13 @@
 # ModpackUpdater
 A tool to update and install modpacks from a simple url, this tool allows you to include shaders and texture packs
+
+## Themes
+The tool has 3 themes
+You can choose whatever you want
+
+### Light:
+![light_img](https://raw.githubusercontent.com/KarmaConfigs/ModpackUpdater/master/imgs/light_preview.png)
+### Dark:
+![dark_img](https://raw.githubusercontent.com/KarmaConfigs/ModpackUpdater/master/imgs/dark_preview.png)
+### System default (depends on your os):
+![dark_img](https://raw.githubusercontent.com/KarmaConfigs/ModpackUpdater/master/imgs/default_preview.png)