[dataset] (tf records) Add the label_map file, so that everyone has the same one

dataset/tf_records/label_map.pbtxt

+item {
+  id: 1
+  name: 'car'
+}
+
+item {
+  id: 2
+  name: 'watcher'
+}
+
+item {
+  id: 3
+  name: 'base'
+}
+
+item {
+  id: 4
+  name: 'armor'
+}
+
+item {
+  id: 5
+  name: 'ignore'
+}