Add Datadog RUM (#28)

src/services/__mocks__/monitoring.js

@@ -0,0 +1 @@
+// no actual monitoring with mock

src/services/monitoring.js

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+import { datadogRum } from '@datadog/browser-rum';
+
+datadogRum.init({
+    applicationId: '8ecd160c-ad5c-4e06-8d88-3a6b89833246',
+    clientToken: 'pubeb25449bb91773fc993855c7378e375a',
+    site: 'datadoghq.com',
+    service:'ota-portal',
+    // Specify a version number to identify the deployed version of your application in Datadog 
+    // version: '1.0.0',
+    sampleRate: 100,
+    trackInteractions: true
+});