add log monitoring

javascript/trainMonitor.js

@@ -0,0 +1,9 @@
+function start_train_monitoring() {
+  gradioApp().querySelector('#train_error').innerHTML=''
+  var id = randomId()
+  const onProgress = (progress) => gradioApp().getElementById('train_progress').innerHTML = progress.textinfo;
+  requestProgress(id, gradioApp().getElementById('train_gallery'), null, onProgress, false)
+  var res = Array.from(arguments);
+  res[0] = id
+  return res
+}