Updated the README.rst file to mention the schwab-py API

README.rst

@@ -19,6 +19,24 @@
 .. image:: http://codecov.io/github/alexgolec/tda-api/coverage.svg?branch=master
   :target: http://codecov.io/github/alexgolec/tda-api?branch=master
 
+|schwab-py|_ and ``tda-api``'s Future Following the `TD-Ameritrade to Charles Schwab Transition <https://welcome.schwab.com/?cmp=ilc-WKV>`__
+--------------------------------------------------------------------------------------------------------------------------------------------
+
+With the upcoming transition to Charles Schwab, we have been developing
+a new |schwab-py|_ API which implements much of the functionality of
+``tda-api``, but is adapted for `Charles Schwab's API <https://developer.schwab.com/>`__.
+The new |schwab-py|_ API replaces ``tda-api``, and ``tda-api`` will no
+longer be actively maintained.  All new users should refer to |schwab-py|
+for the latest and most up-to-date features.
+
+TD Ameritrade's API endpoints will no longer work after Friday, May
+10th, 2024.  All TD Ameritrade clients will have moved to Charles Schwab,
+and TD Ameritrade will have turned off the TD Ameritrade API endpoints.
+
+.. |schwab-py| replace:: ``schwab-py`` `API
+.. _schwab-py: https://github.com/alexgolec/schwab-py
+
+
 What is ``tda-api``?
 --------------------