Just put the content into the plugin and overwrite the ItemsAdder folder
1. Unzip the downloaded compressed file, and overwrite the data folder inside with the data folder generated by the file
2. Use the command \iazip to package the material
3. Go to this path to get the resource package ["plugins\ItemsAdder\output\generated.zip"]
4. Install the obtained resource package generated.zip
5. Use the command \ia to open the item list of
6. Get items! Have Fun!