add lisp packages

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

@@ -0,0 +1,10 @@
+# -*- mode: snippet -*-
+# name: operator>>
+# key: >>
+# group: operator overloading
+# --
+std::istream& operator>>(std::istream& is, const ${1:Name}& ${2:c})
+{
+         $0
+	 return is;
+}