Add SunPro license as notice.

PiperOrigin-RevId: 403157534
diff --git a/v2/licenses/SunPro.txt b/v2/licenses/SunPro.txt
new file mode 100644
index 0000000..0558f1e
--- /dev/null
+++ b/v2/licenses/SunPro.txt
@@ -0,0 +1,4 @@
+ Developed at SunPro, a Sun Microsystems, Inc. business.
+ Permission to use, copy, modify, and distribute this
+ software is freely granted, provided that this notice
+ is preserved.
\ No newline at end of file