add user manage routes

templates/pages/login.tmpl

@@ -0,0 +1,14 @@
+{{ define "title" }}gonic{{ end }}
+
+{{ define "content" }}
+<div class="padded box mono">
+    <div class="box-title">
+        <span><u>please login</u></span>
+    </div>
+    <form id="login-form" action="/admin/login_do" 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>
+</div>
+{{ end }}