add lisp packages

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

@@ -0,0 +1,9 @@
+# -*- mode: snippet -*-
+# name: adjacent_find
+# key: ajf
+# --
+auto pos = std::adjacent_find(std::begin(${1:container}), std::end($1));
+if (pos != std::end($1)) {
+  $2
+}
+$0