[Synapse]Add auto gen readme files for cli kusto support

specification/synapse/resource-manager/readme.az.md

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+## AZ
+These settings apply only when `--az` is specified on the command line.
+
+``` yaml $(az) && $(target-mode) == 'core'
+az:
+  extensions: synapse
+  namespace: azure.mgmt.synapse
+  package-name: azure-mgmt-synapse
+az-output-folder: $(azure-cli-folder)/src/azure-cli/azure/cli/command_modules/synapse
+python-sdk-output-folder: "$(az-output-folder)/vendored_sdks/synapse"
+input-file:
+  - Microsoft.Synapse/preview/2021-06-01-preview/kustoPool.json
+
+directive:
+  - where:
+      group: 'synapse kusto-pool-database-principal-assignment'
+    set:
+      group: 'synapse kusto database-principal-assignment'
+  - where:
+      group: 'synapse kusto-pool-attached-database-configuration'
+    set:
+      group: 'synapse kusto attached-database-configuration'
+  - where:
+      group: 'synapse kusto-pool-data-connection'
+    set:
+      group: 'synapse kusto data-connection'
+  - where:
+      group: 'synapse kusto-pool-database'
+    set:
+      group: 'synapse kusto database'
+  - where:
+      group: 'synapse kusto-pool-principal-assignment'
+    set:
+      group: 'synapse kusto pool-principal-assignment'
+  - where:
+      group: 'synapse kusto-pool'
+    set:
+      group: 'synapse kusto pool'
+  - where:
+      group: 'synapse kusto-pool-data-connection event-grid'
+    set:
+      group: 'synapse kusto data-connection event-grid'
+  - where:
+      group: 'synapse kusto-pool-data-connection event-hub'
+    set:
+      group: 'synapse kusto data-connection event-hub'
+  - where:
+      group: 'synapse kusto-pool-data-connection iot-hub'
+    set:
+      group: 'synapse kusto data-connection iot-hub'
+
+cli:
+    cli-directive:
+      - where:
+            group: 'KustoPoolDataConnections'
+            param: 'blobStorageEventType'
+        alias:
+          - blob_storage_event_type
+          - bset
+      - where:
+            group: 'KustoPoolDataConnections'
+            param: 'storageAccountResourceId'
+        alias:
+          - storage_account_resource_id
+          - sari
+      - where:
+            group: 'KustoPoolDataConnections'
+            param: 'eventSystemProperties'
+        alias:
+          - event_system_properties
+          - esysp
+      - where:
+            group: 'KustoPoolDataConnections'
+            param: 'managedIdentityResourceId'
+        alias:
+          - managed_identity_resource_id
+          - miri
+      - where:
+            group: 'KustoPoolDataConnections'
+            param: 'sharedAccessPolicyName'
+        alias:
+          - shared_access_policy_name
+          - sapn
+      - where:
+            group: 'KustoPoolDatabasePrincipalAssignments|KustoPoolPrincipalAssignments'
+            param: 'principalAssignmentName'
+        alias:
+          - principal_assignment_name
+          - psn
+      - where:
+            group: 'KustoPool'
+            param: 'enableStreamingIngest'
+        alias:
+          - enable_streaming_ingest
+          - esig
+      - where:
+            group: 'KustoPoolAttachedDatabaseConfigurations'
+            param: 'attachedDatabaseConfigurationName'
+        alias:
+          - attached_database_configuration_name
+          - adcn
+      - where:
+            group: 'KustoPoolAttachedDatabaseConfigurations'
+            param: 'defaultPrincipalsModificationKind'
+        alias:
+          - default_principals_modification_kind
+          - dpmk
+      - where:
+            group: 'KustoPoolAttachedDatabaseConfigurations'
+            param: 'tableLevelSharingProperties'
+        alias:
+          - table_level_sharing_properties
+          - tlsp
+      - where:
+            group: 'KustoPoolDataConnections'
+            op: 'CreateOrUpdate|Update'
+            param: 'parameters'
+        poly-resource: true
+      - where:
+            group: 'KustoPoolDataConnections'
+            op: 'dataConnectionValidation'
+        removed: true
+      - where:
+            group: 'KustoPools'
+            op: 'AddLanguageExtensions'
+        removed: true
+      - where:
+            group: 'KustoPools'
+            op: 'RemoveLanguageExtensions'
+        removed: true
+      - where:
+            group: 'KustoPools'
+            op: 'DetachFollowerDatabases'
+        removed: true
+      - where:
+            group: 'KustoPools'
+            op: 'CreateOrUpdate|Update'
+        removed: true    
+```

specification/synapse/resource-manager/readme.cli.md

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+<!-- region Generated -->
+# Az.Synapse
+This directory contains the Cli common model for the Synapse service.
+
+> Metadata
+``` yaml
+# Migrated from Powershell's readme
+
+```