Added anticipated end of life - based on AWSCLI V1 and Python 3.9 (te…

…chservicesillinois#80)

Adds an End-of-Life and End-of-Support date, matching that of Python 
3.9 to our README. This date will be updated as we merge updates
to this product that increase its expected lifespan.

README.rst

@@ -9,6 +9,13 @@ Subsystem for Linux <https://docs.microsoft.com/en-us/windows/wsl/about>`_.
 Currently, Windows PowerShell, Command Prompt, and Git Shell for
 Windows are supported with limitations (See `Windows Issues`_).
 
+This product is supported by the Cybersecurity Development team at the 
+University of Illinois, on a best-effort basis. As of the last update to 
+this README, the expected End-of-Life and End-of-Support dates of this 
+version are October of 2025, the same as its primary dependencies: the 
+AWS CLI and 
+`Python V3.9 <https://www.python.org/dev/peps/pep-0596/#lifespan>`_.
+
 .. |--| unicode:: U+2013   .. en dash
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