Updated README about the Managed identity client usage

README.md

@@ -50,6 +50,28 @@ Acquiring tokens with MSAL Go follows this general pattern. There might be some
     }
     confidentialClient, err := confidential.New("https://login.microsoftonline.com/your_tenant", "client_id", cred)
     ```
+    * Initializing a Managed Identity client for SystemAssigned:
+
+    ```go
+    import mi "github.com/AzureAD/microsoft-authentication-library-for-go/apps/managedidentity"
+
+    // Managed identity client have a type of ID required, SystemAssigned or UserAssigned
+	miSystemAssigned, err := mi.New(mi.SystemAssigned())
+    if err != nil {
+        // TODO: handle error
+    }
+    ```
+    * Initializing a Managed Identity client for UserAssigned:
+
+    ```go
+    import mi "github.com/AzureAD/microsoft-authentication-library-for-go/apps/managedidentity"
+
+    // Managed identity client have a type of ID required, SystemAssigned or UserAssigned
+	miSystemAssigned, err := mi.New(mi.UserAssignedClientID("YOUR_CLIENT_ID"))
+    if err != nil {
+        // TODO: handle error
+    }
+    ```
 
 1. Call `AcquireTokenSilent()` to look for a cached token. If `AcquireTokenSilent()` returns an error, call another `AcquireToken...` method to authenticate.
 
@@ -96,6 +118,16 @@ Acquiring tokens with MSAL Go follows this general pattern. There might be some
     accessToken := result.AccessToken
     ```
 
+    * ManagedIdentity clietn can simply call `AcquireToken()`:
+    ```go
+    resource := "<Your resource>"
+	result, err := miSystemAssigned.AcquireToken(context.TODO(), resource)
+	if err != nil {
+        // TODO: handle error
+	}
+    accessToken := result.AccessToken
+    ```
+
 ## Community Help and Support
 
 We use [Stack Overflow](http://stackoverflow.com/questions/tagged/msal) to work with the community on supporting Azure Active Directory and its SDKs, including this one! We highly recommend you ask your questions on Stack Overflow (we're all on there!) Also browse existing issues to see if someone has had your question before. Please use the "msal" tag when asking your questions.