Add Vim modelines

Change-Id: I23f30cd9be56089498089f8b12abe3f3e186b525
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/readd.cpp b/readd.cpp
index 684e447..ed32b0a 100644
--- a/readd.cpp
+++ b/readd.cpp
@@ -92,3 +92,4 @@
     return 0;
 }
 
+// vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4