Add link to original-minh branch to readme

Author: r-hensley

README.md

@@ -6,3 +6,5 @@ A couple comments:
 - In order to run the code in the "code" folder, you may need to run "make" in the folder to build the programs. If this fails with an error about "TFile.h" or something like that, that means you're missing ROOT, so install ROOT on your computer and source the ROOT install's `source $(ROOTDIR)/bin/thisroot.sh` file.
 - If it complains about some kind of "patch", do `dnf install patch`.
 - If there's other problems installing ROOT or making the code directory, try installing [ROOT's required dependencies](https://root.cern/install/dependencies/#fedora-scientific-linux-and-centos). CentOS8 is probably the closest to AlmaLinux so you can follow those ones. It's a good group of programs that are required by many other things. For example, g++ is not installed by default on AlmaLinux, and that'll be needed to make things. There will be a couple things that AlmaLinux can't find, try doing `dnf install ... --skip-broken` ([skip-broken ref](https://dnf.readthedocs.io/en/latest/command_ref.html#skip-broken-option-label)) and it'll skip the ones it can't find. 
+
+The original state of this repository as it was left by Minh on the UEM computer before the recomiling and reformatting by Ryan can be found in the [original-minh branch](https://github.com/prebys/mu2e_UEM_firmware/tree/original-minh).