Added master repository URL.

README.md

@@ -1,4 +1,5 @@
 # Isabelle/OFMC - Linking OFMC and Isabelle/HOL
+
 This is a developer release for Isabelle/OFMC, i.e., while it may be
 of interested to experts, it is not yet useable by the general
 public. This development version comprise a small Isabelle
@@ -8,12 +9,23 @@ fixed-point module, anb2thy generate a Isabelle theory (for
 file for protocols that haven been successfully validated by OFMC. 
 
 ## Team 
+
 * [Achim D. Brucker](http://www.brucker.ch/)
 
 ## License
+
 This project is licensed under a 2-clause BSD-style license.
 
+SPDX-License-Identifier: BSD-2-Clause
+
+## Master Repository
+
+The master git repository for this project is hosted by the [Software
+Assurance & Security Research Team](https://logicalhacking.com) at
+<https://git.logicalhacking.com/ProtocolSecurity/isabelle-ofmc>.
+
 ## Publications
+
 * Achim D. Brucker and Sebastian A. Mödersheim. [Integrating Automated 
   and Interactive Protocol Verification](https://www.brucker.ch/bibliography/download/2009/brucker.ea-integrating-2009.pdf). 
   In Workshop on Formal Aspects in Security and Trust (FAST 2009). Lecture