[MINOR] community: Add security.md (#2268)

### What changes were proposed in this pull request?

 Add security.md

### Why are the changes needed?
Graduation mature assessment

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
No need.

security.md

@@ -0,0 +1,30 @@
+<!--
+  ~ 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.
+  -->
+
+# Security
+
+The Apache Software Foundation takes a rigorous stance on eliminating security issues in its software projects. Likewise, Apache Uniffle (incubating) is also vigilant and takes security issues related to its features and functionality into the highest consideration.
+
+If you have any concerns regarding Uniffle's security,
+or you discover a vulnerability or potential threat,
+please do not hesitate to get in touch with the Apache Security Team by dropping an email at [email protected].
+
+Please specify the project name as "Uniffle" in the email, and provide a description of the relevant problem or potential threat. You are also urged to recommend how to reproduce and replicate the issue.
+
+The Apache Security Team and the Uniffle community will get back to you after assessing and analyzing the findings.
+
+Please note that the security issue should be reported on the security email first, before disclosing it on any public domain.