Add test form in development mode

This helps to test submissions in development mode

app/views/forms/form.html.erb

@@ -0,0 +1,22 @@
+<h1><%= @form.title %></h1>
+<p>
+  <%= link_to 'Google spreadsheet', @form.google_spreadsheet_url %>
+</p>
+<form method="post" action="<%= submission_url(@form) %>" enctype="multipart/form-data">
+
+  <p>
+    <label>Text</label>
+    <input type="text" name="text">
+  </p>
+  <p>
+    <label>Array</label>
+    <input type="checkbox" name="array[]" value="1">
+    <input type="checkbox" name="array[]" value="2">
+    <input type="checkbox" name="array[]" value="3">
+  </p>
+  <p>
+    <label>File</label>
+    <input type="file" name="file">
+  </p>
+  <input type="submit" value="senden">
+</form>