Minimalistic README file. Please review

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@5075 f5dc347c-c33d-0410-90a0-b07cc1902cb9

scripts/README

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+This directory contains some command line scripts useful for performance
+or integration issues. Please refer to the mantis manual for a more complete
+documentation about their purpose and usage.
+
+Included scripts:
+
+checkin.php
+    Provides source control (SCM) integration for closing bugs upon commits
+
+send_emails.php
+    Allows sending bug mails asynchronously