Add appendElement function

Author: Marek Fisera

src/Components/test/testassets/BasicTestApp/wwwroot/JSInitializers/ClassicAndModern/BasicTestApp.lib.module.js

@@ -36,6 +36,7 @@ export function afterServerStarted() {
     appendElement('classic-and-modern-after-server-started', 'Classic and modern "afterServerStarted"');
 }
 
+// Duplicated in Components.TestServer\wwwroot\Components.TestServer.lib.module.js
 function appendElement(id, text) {
     var content = document.getElementById('initializers-content');
     if (!content) {

src/Components/test/testassets/Components.TestServer/.gitignore

@@ -4,4 +4,16 @@ export function beforeWebAssemblyStart() {
 
 export function afterWebAssemblyStarted() {
     appendElement('server--classic-and-modern-after-web-assembly-started', 'Server project Classic and modern "afterWebAssemblyStarted"');
-}
+}
+
+// Duplicated in BasicTestApp\wwwroot\JSInitializers\ClassicAndModern\BasicTestApp.lib.module.js
+function appendElement(id, text) {
+    var content = document.getElementById('initializers-content');
+    if (!content) {
+        return;
+    }
+    var element = document.createElement('p');
+    element.id = id;
+    element.innerText = text;
+    content.appendChild(element);
+}