Update README.md

README.md

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 # itementitypicker
 A fabric mod for Player-based item entity filter in 1.20.4
+
+## Command
+Main command /picker
+
+- `/picker help` list usage and descriptions
+- `/picker` toggle mod on off
+- `/picker [on/off]` set mod on off
+- `/picker mode` show current mode
+- `/picker mode [blacklist, whitelist] ` for mode selection
+  <br>`Blacklist`: throw any item picked up that Within the Blacklist
+  <br>`Whitelist`: throw any item picked up Not In the Whitelist (Keep item if in whitelist)
+- `/picker list` list all items added into blacklist and whitelist
+- `/picker [add/del] <item type>` add/remove item to/from the current mode list
+  <br> `item type is Not nbt/component-sensitive`
+
+## Usage
+Useful to filter desire unstackables using whitelist (i.e. Totem_of_undying in raid farm)
+
+## Other
+No keybind, No gui