Add instructions for cloning the repository

GETTING_STARTED.md

@@ -1,5 +1,16 @@
 # Clone the repository
 
+If you do not have git installed on your system. Please install it now 
+(see the git documentation for [instructions on installing git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)).
+
+To retrieve the code from the repository on anhonesthost.net run:
+
+```
+clone https://repo.anhonesthost.net/rho_n/hpr_generator.git
+```
+On success, an "hpr_generator" directory will be created in the folder from 
+which the clone command was executed containing a local copy of the git repository.
+
 # Install required Perl modules
 
 # Create HPR database