Add FAQ item for how to transfer a package to General from another re…

…gistry (#99787)

* Add FAQ item for how to transfer a package to General from another registry

* Update README.md

README.md

@@ -234,6 +234,14 @@ Technically if you skip the second step things will keep working, because GitHub
 but it is best practice. For this reason, when you try to register a new release, the Julia
 Registrator will complain if the second step is skipped.
 
+#### How do I transfer a package to General from another registry?
+
+You can simply register your next release in General (and don't change the package's name or UUID!).
+This will be treated as a new package registration in General and be subject to the usual 3-day waiting period.
+Once registered, Pkg.jl will look at all the versions from all registries it knows about, and use the compat
+mechanism to figure out what version to resolve to as usual, regardless if some versions are in different registries
+from others.
+
 #### Where do I report a problem with a package in the General registry?
 
 Report it to the package repository.