Added README template for Gtk2_FileDrop.

README

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+This package is http://pear.php.net/package/Gtk2_FileDrop and has been migrated from http://svn.php.net/repository/pear/packages/Gtk2_FileDrop
+
+Please report all new issues via the PEAR bug tracker.
+
+If this package is marked as unmaintained and you have fixes, please submit your pull requests and start discussion on the pear-qa mailing list.
+
+To test, run either
+$ phpunit tests/
+  or
+$ pear run-tests -r
+
+To build, simply
+$ pear package
+
+To install from scratch
+$ pear install package.xml
+
+To upgrade
+$ pear upgrade -f package.xml