adding release notes (Azure#26018)

Co-authored-by: Praveenkumar Ravikumar <prravikumar@microsoft.com>

Author: gorandom

sdk/redis/Microsoft.Azure.Management.Redis/src/Microsoft.Azure.Management.Redis.csproj

@@ -9,7 +9,20 @@
     <Version>8.0.0</Version>
     <AssemblyName>Microsoft.Azure.Management.Redis</AssemblyName>
     <PackageTags>Microsoft Azure Redis Cache management;Redis Management;</PackageTags>
-    <PackageReleaseNotes>Added support for specifying ports to RedisRebootParameters to enable rebooting cache instances based on their exposed port information.</PackageReleaseNotes>
+    <PackageReleaseNotes>
+      [Breaking changes included]
+        1. The type of "RedisConfiguration" is modified from IDictionary&lt;string, string&gt; to Microsoft.Azure.Management.Redis.Models.RedisCommonPropertiesRedisConfiguration in the following places
+            Microsoft.Azure.Management.Redis.Models.RedisResource
+            Microsoft.Azure.Management.Redis.Models.RedisCreateParameters
+            Microsoft.Azure.Management.Redis.Models.RedisUpdateParameters
+
+      [New Features]
+        1. Managed Identity can be assigned during creation of Microsoft.Azure.Management.Redis.Models.RedisResource
+        2. Managed Identity assigned to RedisResource can be updated or deleted.
+        
+      [Updates]
+        1. Api version "2021-06-01" will be used in the HTTP requests.
+    </PackageReleaseNotes>
   </PropertyGroup>
   <PropertyGroup>
     <TargetFrameworks>$(SdkTargetFx)</TargetFrameworks>