Add test echo application

lib/Controller/PageController.php

@@ -1,6 +1,7 @@
 <?php
 namespace OCA\UPschooling\Controller;
 
+use OCP\AppFramework\Http\TextPlainResponse;
 use OCP\IRequest;
 use OCP\AppFramework\Http\TemplateResponse;
 use OCP\AppFramework\Http\DataResponse;
@@ -28,4 +29,8 @@ class PageController extends Controller {
 		return new TemplateResponse('upschooling', 'index');  // templates/index.php
 	}
 
+	public function doEcho() {
+	    return new DataResponse($_POST);
+	}
+
 }

templates/content/index.php

@@ -1 +1,11 @@
 <h1>Hello world</h1>
+
+<hr>
+
+<label for="text">Text to Send:</label><input type="text" id="text">
+<button id="submit">Submit</button>
+
+<hr>
+
+<label for="response">Response:</label>
+<textarea id="response"></textarea>