HDDS-8631. Update Ozone document for symmetric block token (#4727)

hadoop-hdds/docs/content/design/symmetric-token-signatures.md

@@ -0,0 +1,29 @@
+---
+title: Ozone Token Signatures using Symmetric Keys
+summary: Use symmetric keys to sign and verify Ozone tokens (block and container tokens).
+date: 2023-05-17
+jira: HDDS-7733
+status: implemented
+author: Duong Nguyen, Ritesh Shukla, Istvan Fajth
+---
+<!--
+  Licensed 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. See accompanying LICENSE file.
+-->
+
+# Abstract
+
+Improve Ozone Manager performance by properly using symmetric key algorithm to sign block tokens.
+
+# Link
+
+https://issues.apache.org/jira/secure/attachment/13055974/Symmetric%20Key%20For%20Ozone%20Token%20Signatures-1.pdf