Add client-sdk.json for cognitive services speech

metadata/latest/client-sdk.json

@@ -0,0 +1,9 @@
+{
+  "Name": "client-sdk",
+  "Version": "1.28.0",
+  "ServiceDirectory": "NA",
+  "Group": "com.microsoft.cognitiveservices.speech",
+  "SdkType": "client",
+  "IsNewSdk": false,
+  "ArtifactName": "client-sdk"
+}