Update README.md

README.md

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-ISSM
-Ice-sheet and Sea-level System Model (ISSM): a framework for modeling ice flow 
-on ice sheet/ice shelf systems using Finite Element Analysis, and parallel 
-technologies.
+# ISSM
 
+## Description
+Ice-sheet and Sea-level System Model (ISSM): a framework for modeling ice flow on ice sheet/ice shelf systems using Finite Element Analysis, and parallel technologies.
+
+## Contact
 Email: issm at jpl dot nasa dot gov
 
 Website: https://issm.jpl.nasa.gov/
+
+## Checking Out a Copy of the Repository
+Navigate to the parent directory where you want the ISSM repository to be located and run,
+```
+git clone https://github.com/ISSMteam/ISSM.git
+```