add Build.PL
Checking in changes prior to tagging of version 0.12.

Changelog diff is:

diff --git a/Changes b/Changes
index 49b01c9..c6f9103 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension p5-Yancha-Plugin-SuddenlyDeath

 {{$NEXT}}

+0.12 2013-10-13T17:16:56Z
+
+    - add Build.PL
+    - fix markdown preview
+
 0.11 2013-10-13T17:01:22Z

     - original version