Update README.md

README.md

@@ -4,4 +4,23 @@ code is shit
 very incomplete  
 report all issues found pls  
   
-![screenshot](https://mrrp.sx7n8.tech/sun/cdscript/raw/branch/main/screenshot.png)
+![screenshot](https://mrrp.sx7n8.tech/sun/cdscript/raw/branch/main/screenshot.png)   
+   
+```
+Script to create printable CD jewel case inserts
+
+Usage:
+  ./cdscript.sh -p <paper> -c <cover> -b <back> [-i <back_image>] [-m <border>] -o <output>
+
+Required options:
+  -p  Paper format            a4 | letter
+  -c  Album cover path        Path to cover image 
+  -b  Back type               no | image
+  -o  Output file             Path to save the resulting insert (NO PNG)
+
+Optional options:
+  -i  Back image path         Required if back type is 'image'
+  -m  Border width (px)       Adds a border around the cover/back
+
+DO NOT USE PNG FOR OUTPUT
+```