[#78] add top level Makefile to satisfy cpanm run-from-git

Makefile.PL

@@ -0,0 +1,15 @@
+use inc::Module::Install;
+ 
+name     'App-Netdisco';
+license  'bsd';
+all_from 'Netdisco/lib/App/Netdisco.pm';
+
+build_subdirs 'Netdisco';
+
+resources
+  homepage => 'http://netdisco.org/',
+  bugtracker => 'http://sourceforge.net/p/netdisco/bugs/',
+  repository => 'git://git.code.sf.net/p/netdisco/netdisco-ng',
+  MailingList => 'https://lists.sourceforge.net/lists/listinfo/netdisco-users';
+
+WriteAll;