Add predefined templates for task descriptions

app/Validator/PredefinedTaskDescriptionValidator.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Kanboard\Validator;
+
+use SimpleValidator\Validator;
+use SimpleValidator\Validators;
+
+class PredefinedTaskDescriptionValidator extends BaseValidator
+{
+    public function validate(array $values)
+    {
+        $v = new Validator($values, array(
+            new Validators\Required('title', t('This value is required')),
+            new Validators\Required('description', t('This value is required')),
+        ));
+
+        return array(
+            $v->execute(),
+            $v->getErrors()
+        );
+    }
+}