Added a Git setup-repository script

[أحمد المحمودي <aelmahmoudy@users.sourceforge.net>]

Hello,

  I've added a setup-repository script (based on pkg-perl's script) to 
  easily add Git repositories for debian-science.

  The script resides in /git/debian-science/packages.

-- 
 ‎أحمد المحمودي (Ahmed El-Mahmoudy)
  Digital design engineer
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