add back deprecation notice (Azure#23066)

Author: kristapratico

sdk/cognitiveservices/azure-cognitiveservices-formrecognizer/README.md

@@ -1,3 +1,8 @@
+## NOTE: This package has been deprecated
+
+This version has endpoints that are no longer active. To use the more recent version of the Azure Form Recognizer service,
+please install the azure-ai-formrecognizer package found here: https://pypi.org/project/azure-ai-formrecognizer/
+
 # Microsoft Azure SDK for Python
 
 This is the Microsoft Azure Cognitive Services Form Recognizer Client Library.

sdk/cognitiveservices/azure-cognitiveservices-formrecognizer/setup.py

@@ -61,7 +61,7 @@
     author_email='[email protected]',
     url='https://github.com/Azure/azure-sdk-for-python',
     classifiers=[
-        'Development Status :: 4 - Beta',
+        'Development Status :: 7 - Inactive',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',