Began Setup of Service Worker

Add js file for Service Worker to begin process of caching files for offline mode.

index.html

@@ -185,6 +185,20 @@
     		</div>
         </div>
 
+        <!-- Checks is there is a service worker and adds or updates -->
+        <!-- <script>
+            if ('serviceWorker' in navigator) {
+              window.addEventListener('load', () => {
+                navigator.serviceWorker.register('sw.js')
+                .then(swReg => {
+                  console.log('Service Worker is registered', swReg);
+                })
+                .catch(err => {
+                  console.error('Service Worker Error', err);
+                });
+              });
+            }
+        </script> -->
         <!-- <script src="js/vendor/modernizr-3.5.0.min.js"></script> -->
         <script>window.jQuery || document.write('<script src="js/vendor/jquery-3.2.1.min.js"><\/script>')</script>