Improved: Add a GH SECURITY.md page to framework and plugins branches…

… (OFBIZ-12833)

After reading this [email protected] thread
https://lists.apache.org/thread/z0xbcr14rpb1r701bkxjpxqn7lstykl9
I decided to add, for now, a simple SECURITY.md, like in Apache Commons
https://github.com/apache/commons-io/blob/master/SECURITY.md.

We could get further and add a page like in Apache Groovy
https://github.com/apache/groovy/blob/master/.github/SECURITY.md

SECURITY.md

@@ -0,0 +1,17 @@
+<!---
+ Licensed to the Apache Software Foundation (ASF) under one or more
+ contributor license agreements.  See the NOTICE file distributed with
+ this work for additional information regarding copyright ownership.
+ The ASF licenses this file to You under the Apache License, Version 2.0
+ (the "License"); you may not use this file except in compliance with
+ the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+-->
+The Apache OFBiz security page is [https://ofbiz.apache.org/security.html](https://ofbiz.apache.org/security.html).