Add retirement notice (#15227)

* Add retirement notice

* Added a note on module retirement

Co-authored-by: Damien Caro <[email protected]>

Author: dingmeng-xue

src/Blockchain/Az.Blockchain.psd1

@@ -30,7 +30,10 @@ CompanyName = 'Microsoft Corporation'
 Copyright = 'Microsoft Corporation. All rights reserved.'
 
 # Description of the functionality provided by this module
-Description = 'Microsoft Azure PowerShell: Blockchain cmdlets'
+Description = 'Microsoft Azure PowerShell: Blockchain cmdlets
+On September 10, 2021, Azure Blockchain will be retired. Please migrate ledger data from Azure Blockchain Service to an alternative offering based on your development status in production or evaluation.
+For more information on evaluating alternatives, see Migrate Azure Blockchain Service (https://docs.microsoft.com/en-us/azure/blockchain/service/migration-guide).
+The module will be retired after September 10, 2021'
 
 # Minimum version of the PowerShell engine required by this module
 PowerShellVersion = '5.1'

src/Blockchain/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Updated the description of module and added retirement notice
 
 ## Version 0.2.0
 * Fixed SecureString parameters of `New-AzBlockchainMember` on Linux [12707]