add test template and test route

Author: luojiyin1987

routes/template-test.ai

@@ -0,0 +1,7 @@
+route /template {
+    get /hello {
+        name: str,
+        is_admin: bool = false,
+    }
+    return render("hello-page.jinja", query)
+}

templates/hello-page.jinja

@@ -0,0 +1,5 @@
+{% if query.is_admin %}
+<div>Hello, {{ query.name }} (Admin)</div>
+{% else %}
+<div>Hello, {{ query.name }}</div>
+{% endif %}