Added Disclaimer that This project is not maintained anymore

Signed-off-by: Shailesh Vaidya <shailesh.vaidya@seagate.com>

README.md

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 <img src="../main/doc/images/cortx-logo.png?raw=true">
 
+# Disclaimer: This project is not maintained anymore
+
 ## The CORTX Project
 
 CORTX is Seagate's proof-of-concept research project into distributed object storage systems, with an emphasis on HPC, efficiency, massive capacity, and high HDD-utilization.  **CORTX is 100% Open Source.** Most of the project is licensed under the [Apache 2.0 License](../main/LICENSE) and the rest is under AGPLv3; check the specific License file for each submodule to determine which is which.