Add readme note about tags and branches

README.md

@@ -1,6 +1,12 @@
 # Overview
 This is a collection of pre-built library dependencies for LÖVE on Apple platforms.
 
+## Versions
+
+This repository uses git tags for the library dependencies of a specific released version of LÖVE.
+
+For in-development versions of LÖVE, there may be a branch in this repository corresponding to a similar branch in the love repository.
+
 ## Building LÖVE for macOS
 Get this repository as well as [love2d/love](https://github.com/love2d/love).