Update README.md

README.md

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 ## Key features
 
+### **Color themes**
+
+**Allows you to change theme within the app. Supports Purple, pink, green, blue, orange and yellow!**
+
 ### **Unlisted posting**
 
 **Allows you to post publicly without having your post show up in trends, hashtags or public timelines (i.e., in the tabs “Local”, “Community” and “Posts”).**