Add Command Block and Structure block to the fix list (#1119)

* Add Command Block and Structure block to the fix list

* Add Horse Inventory to the fix list

Added Horse to the What's left to be added/fixed list.

README.md

@@ -39,6 +39,9 @@ Take a look [here](https://github.com/GeyserMC/Geyser/wiki#Setup) for how to set
   - [ ] Beacon
   - [ ] Cartography Table
   - [ ] Stonecutter
+  - [ ] Command Block
+  - [ ] Structure Block
+  - [ ] Horse Inventory
 - Some Entity Flags
 
 ## Compiling