add more readme and git reference

cmd/server/main.go

@@ -79,6 +79,7 @@ var uploadTpl = template.Must(template.New("upload").Parse(`
       </form>
 
       <p class="note">API docs: <a href="/swagger">Swagger UI</a></p>
+      <p class="note">Source: <a href="https://git.coadcorp.com/nathan/gliffy2drawio" target="_blank" rel="noopener">git.coadcorp.com/nathan/gliffy2drawio</a></p>
     </div>
   </div>