[AzureLoadTesting] Updated tests and readme file (Azure#24272)

* rename file

* updated js tests

* updated readme

* updated readme

* updated readme

Author: venkatr21

sdk/loadtestservice/arm-loadtesting/README.md

@@ -1,4 +1,4 @@
-# Azure LoadTest client library for JavaScript
+# Azure Load Testing client library for JavaScript
 
 This package contains an isomorphic SDK (runs both in Node.js and in browsers) for Azure LoadTest client.
 
@@ -64,6 +64,109 @@ const client = new LoadTestClient(new DefaultAzureCredential(), subscriptionId);
 // const client = new LoadTestClient(credential, subscriptionId);
 ```
 
+### Create an Azure Load Testing resource
+
+Create a new Azure Load Testing resource.
+```javascript
+loadTestResourceCreatePayload = {
+  location: "westus2"
+};
+
+const resource = await client.loadTests.beginCreateOrUpdateAndWait(
+  "sample-rg",
+  "sample-loadtesting-resource",
+  loadTestResourceCreatePayload
+);
+
+console.log(resource);
+```
+
+Create a new Azure Load Testing resource with managed identity and customer managed key encryption.
+```javascript
+loadTestResourceCreatePayload = {
+  location: "westus2",
+  tags: { team: "testing" },
+  identity: {
+    type: 'SystemAssigned, UserAssigned',
+    userAssignedIdentities: {
+      '/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/sample-rg/providers/microsoft.managedidentity/userassignedidentities/identity1': {}
+    }
+  },
+  encryption: {
+    identity: {
+      type: 'UserAssigned',
+      resourceId: '/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/sample-rg/providers/microsoft.managedidentity/userassignedidentities/identity1'
+    },
+    keyUrl: 'https://sample-kv.vault.azure.net/keys/cmkkey/2d1ccd5c50234ea2a0858fe148b69cde'
+  }
+};
+
+const resource = await client.loadTests.beginCreateOrUpdateAndWait(
+  "sample-rg",
+  "sample-loadtesting-resource",
+  loadTestResourceCreatePayload
+);
+
+console.log(resource);
+```
+
+### Get an Azure Load Testing resource
+
+```javascript
+let resourceName = 'sample-loadtesting-resource';
+let resourceGroupName = 'sample-rg';
+
+const resource = await client.loadTests.get(
+  resourceGroupName,
+  resourceName
+);
+
+console.log(resource);
+```
+
+### Update an Azure Load Testing resource
+
+```javascript
+loadTestResourcePatchPayload = {
+  tags: { team: "testing-dev" },
+  identity: {
+    type: 'SystemAssigned, UserAssigned',
+    userAssignedIdentities: {
+      // removing a user-assigned managed identity by assigning the value in the payload as null
+      '/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/sample-rg/providers/microsoft.managedidentity/userassignedidentities/identity1': null,
+      '/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/sample-rg/providers/microsoft.managedidentity/userassignedidentities/identity2': {}
+    }
+  },
+  encryption: {
+    // use system-assigned managed identity for CMK encryption
+    identity: {
+      type: 'SystemAssigned',
+      resourceId: null
+    },
+    keyUrl: 'https://sample-kv.vault.azure.net/keys/cmkkey/2d1ccd5c50234ea2a0858fe148b69cde'
+  }
+};
+
+const resource = await client.loadTests.beginUpdateAndWait(
+  "sample-rg",
+  "sample-loadtesting-resource",
+  loadTestResourcePatchPayload
+);
+
+console.log(resource);
+```
+
+### Delete an Azure Load Testing resource
+
+```javascript
+let resourceName = 'sample-loadtesting-resource';
+let resourceGroupName = 'sample-rg';
+
+const result = await client.loadTests.beginDeleteAndWait(
+  resourceGroupName,
+  resourceName
+);
+```
 
 ### JavaScript Bundle
 To use this client library in the browser, first you need to use a bundler. For details on how to do this, please refer to our [bundling documentation](https://aka.ms/AzureSDKBundling).