Add missing NOTICE file.

Test: treehugger
Change-Id: I3d18ef1ddb6fce05004d4d0fa355f9996bb47da0
diff --git a/NOTICE b/NOTICE
new file mode 120000
index 0000000..7a694c9
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1 @@
+LICENSE
\ No newline at end of file