added utilFunction to check internet Connectivity

src/utils/common/utilFunctions.ts

@@ -0,0 +1,9 @@
+import errorCodes from './errorCodes';
+
+export function checkConnectivity() {
+    if (navigator.onLine) {
+        return true;
+    } else {
+        throw new Error(errorCodes.ERR_NO_INTERNET_CONNECTION);
+    }
+}