add lisp packages

lisp/yasnippet-snippets/snippets/c++-mode/lwr

@@ -0,0 +1,7 @@
+# -*- mode: snippet -*-
+# name: string to lower case
+# key: lwr
+# --
+std::transform(std::begin(${1:container}), std::end($1), std::begin($1), [](char c) {
+return std::tolower(c);});
+$0