create basic frontend

templates/admin/login.tmpl

@@ -0,0 +1,12 @@
+{{ define "title" }}gonic{{ end }}
+
+{{ define "content" }}
+<div class="light">
+    <span>login</span>
+</div>
+<form id="login-form" action="/admin/authenticate" method="post">
+    <input type="text" id="username" name="username" placeholder="username">
+    <input type="password" id="password" name="password" placeholder="password">
+    <input type="submit" value="login">
+</form>
+{{ end }}