Improved: repository ofbiz-site does not have a license

THanks to Pierre for report, it also missed a NOTICE, here it is
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000..d76faf1
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,5 @@
+Apache OFBiz
+Copyright 2001-2020 The Apache Software Foundation
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).