Update README.rst

Add deprecation notice and provide links to new repository location.

Author: marcbonnici

README.rst

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-Workload Automation
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+[DEPRECATED] Workload Automation
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+⚠️ **Development of this project has moved to a new repository.**
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+Please visit the new location for the latest code, issues, and contributions:
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+https://gitlab.arm.com/tooling/workload-automation/workload-automation
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+This repository is no longer actively maintained.
+
+-------------
 
 Workload Automation (WA) is a framework for executing workloads and collecting
 measurements on Android and Linux devices. WA includes automation for nearly 40