add LICENSE

fsim/fpga_mem_gen

@@ -1,9 +1,11 @@
-#!/usr/bin/env python
+#! /usr/bin/env python
+
+# See LICENSE for license details.
+# This is based off of reference-chip/vlsi/src/vlsi_mem_gen
+
 import sys
 import math
 
-# This is based off of reference-chip/vlsi/src/vlsi_mem_gen
-
 use_latches = 1