If you want to use the api provided by this mod you'll want to implement and include this mod:
repositories {
maven { url "https://jitpack.io/" }
}
dependencies {
modImplementation "com.github.siphalor:amecs:+"
include "com.github.siphalor:amecs:+"
}If you don't want to shadow this whole mod you may just want to copy the relevant interfaces/classes from de.siphalor.amecs.api.
This mod is available under the CC0 license. Feel free to learn from it and incorporate it in your own projects.