Update README.md

README.md

@@ -108,7 +108,7 @@ Hyde theme import 'Hack the Box' 'https://github.com/HyDE-Project/Hyde-gallery'
 
 - You can make your own themes and add them to our collection
     1. Share your theme to our collection by adding an entry at the [hyde-themes.json](https://github.com/HyDE-Project/hyde-gallery/blob/hyde-gallery/hyde-themes.json) file.
-    2. Create a directory with the "Theme Name" then add preview image. Please  lessen the compression by using jpg.
+    2. Create a directory with the "Theme Name" then add preview image. Please  lessen the compression by using jpg and service such as [this](https://www.iloveimg.com/compress-image).
     3. Genenerating the README.md by running the ` python generate_readme.py ` script.
 - Remember to also add a preview by making a theme directory and one preview image inside it.