Update README.md

README.md

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 # CodFrame
 
+A simple ItemFrame protect and in-frame item preview plugin.
+
+**This is a PAPER only plugin, can run on [Paper](https://papermc.io/), or Paper's fork like [Purpur](https://purpurmc.org/) only! DO NOT INSTALL ON SPIGOT!**
+
+**This plugin require Java 17 and up to be run.**
+
+## Why CodFrame
+
+CodFrame can protect your items in itemframe to avoid grief like explosion, shoot, lava, fire, block break, interact, rotate. 
+
+Also provide a cool and useful item-showcase feature to allow any player preview your awesome armor/weapon, or read your book without take out from ItemFrame!
+
 ## Command
-`/codframe` - Set a ItemFrame to CodFrame.
+`/codframe` - Set or remove a CodFrame when you looking at a ItemFrame.
 
 ## Permission
-
-`codframe.admin` - Permission to bypass the owner check, force remove any exists CodFrame.
+`codframe.admin` - Bypass the owner check, force remove a exists CodFrame.
 
 ## Demo Video