Add Config Example for Microsoft Entra ID to Docs (#1044)

Author: masiddee

docs/docs/providers/microsoft-entra-id.md

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+# Microsoft Entra ID
+
+If you're using Microsoft Identity platform and want to add App Auth to your React Native application, you'll need an Entra application to authorize against.
+
+Microsoft offers mupltiple different PLatform configurations you could setup for your application. In this example, we are using the `Mobile and desktop applications` platform configuration.
+
+You can find detailed instructions on registering a new Entra application [here](https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app?tabs=certificate).
+
+NOTES:
+
+- Microsoft Entra ID does not have a `revocationEndpoint`.
+- Application ID can be viewed in your Entra application's dashboard.
+- Authorization and Token endpoints can be found under the `Endpoints` link at the top of the page in your Entra application's dashboard.
+
+```js
+const config = {
+  serviceConfiguration: {
+    authorizationEndpoint: 'https://login.microsoftonline.com/{TENANT_ID}/oauth2/v2.0/authorize',
+    tokenEndpoint: 'https://login.microsoftonline.com/{TENANT_ID}/oauth2/v2.0/token',
+  },
+  clientId: '<APPLICATION_ID>',
+  redirectUrl: 'com.my-app://oauth/redirect', // 'com.my-app' should correspond to your app name
+  scopes: ['openid', 'profile', 'email', 'offline_access'],
+};
+
+// Log in to get an authentication token
+const authState = await authorize(config);
+
+// Refresh token
+const refreshedState = await refresh(config, {
+  refreshToken: authState.refreshToken,
+});
+```