readme: Add security vulnerabilities handling

Using Arm Developer report security vulnerabilities

Signed-off-by: Martin Kojtal <martin.kojtal@arm.com>

README.md

@@ -351,3 +351,9 @@ With ML Eval Kit you can run inferences on either a custom neural network on Eth
 The software is provided under the Apache-2.0 license. All contributions to software and documents are licensed by contributors under the same license model as the software/document itself (ie. inbound == outbound licensing). ATS-Keyword may reuse software already licensed under another license, provided the license is permissive in nature and compatible with Apache v2.0.
 
 Folders containing files under different permissive license than Apache 2.0 are listed in the LICENSE file.
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+## Security issues reporting
+
+If you find any security vulnerabilities, please do not report it in the GitLab issue tracker. Instead, send an email to the security team at arm-security@arm.com stating that you may have found a security vulnerability in the IoT Total Solution Keyword Detection project.
+
+More details can be found at [Arm Developer website](https://developer.arm.com/support/arm-security-updates/report-security-vulnerabilities).