Add wwwroot assets to the ResponseFormattingSample (#4161)

* Add wwwroot assets to ResponseFormattingSample

Add-on PR due to the unexpected presence of *wwwroot* in the
*.gitignore* file.

* Delete _references.js

aspnetcore/mvc/models/formatting/sample/wwwroot/css/site.css

@@ -0,0 +1,34 @@
+body {
+    padding-top: 50px;
+    padding-bottom: 20px;
+}
+
+/* Wrapping element */
+/* Set some basic padding to keep content from hitting the edges */
+.body-content {
+    padding-left: 15px;
+    padding-right: 15px;
+}
+
+/* Set widths on the form inputs since otherwise they're 100% wide */
+input,
+select,
+textarea {
+    max-width: 280px;
+}
+
+/* Carousel */
+.carousel-caption {
+    z-index: 10 !important;
+}
+
+    .carousel-caption p {
+        font-size: 20px;
+        line-height: 1.4;
+    }
+
+@media (min-width: 768px) {
+    .carousel-caption {
+        z-index: 10 !important;
+    }
+}

aspnetcore/mvc/models/formatting/sample/wwwroot/css/site.min.css

@@ -0,0 +1 @@
+body{padding-top:50px;padding-bottom:20px}.body-content{padding-left:15px;padding-right:15px}input,select,textarea{max-width:280px}.carousel-caption{z-index:10!important}.carousel-caption p{font-size:20px;line-height:1.4}@media (min-width:768px){.carousel-caption{z-index:10!important}}

aspnetcore/mvc/models/formatting/sample/wwwroot/js/site.js

@@ -0,0 +1 @@
+// Write your Javascript code.