Updated fabric loader from 0.14.23 to 1.15.7. Updated fabric language…

… kotlin from 1.10.14+kotlin.1.9.20 to >=1.10.19+kotlin.1.9.23. Updated Kotlin from 1.9.20 to 1.9.23. Updated mod version from 1.0.0+1.19.4 to 1.1+1.19.4

Updated README.md to have some intructions for using the published Gi…

…tHub package