Update readme with transformation directives for resources (#37005)

Added directives for transforming client names in resource definitions.

Author: kamboj-prjwl

specification/network/resource-manager/readme.md

@@ -126,6 +126,21 @@ suppressions:
   - code: SystemDataDefinitionsCommonTypes
     from: network.json
     reason: False alarm.
+directive:
+  - from: specification/common-types/resource-management/v6/types.json
+    where: "$.definitions.ProxyResource"
+    transform: >
+      $["x-ms-client-name"] = "SecurityPerimeterProxyResource"
+      
+  - from: specification/common-types/resource-management/v6/types.json
+    where: "$.definitions.Resource"
+    transform: >
+      $["x-ms-client-name"] = "SecurityPerimeterResource"
+
+  - from: specification/common-types/resource-management/v6/types.json
+    where: "$.definitions.systemData"
+    transform: >
+      $["x-ms-client-name"] = "SecurityPerimeterSystemData"
 ```
 
 ### Tag: package-2024-09-preview