Add video annotation example

examples/video_annotation/README.md

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+# Video Annotation Example
+
+
+## Annotation
+
+```bash
+labelme data_annotated --labels labels.txt --nodata --keep-prev
+```
+
+<img src=".readme/00000100.jpg" width="49%" /> <img src=".readme/00000101.jpg" width="49%" />
+
+*Fig 1. Video annotation example. A frame (left), The next frame (right).*

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examples/video_annotation/data_annotated/00000101.json

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examples/video_annotation/data_annotated/00000102.json

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examples/video_annotation/data_annotated/00000103.json

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examples/video_annotation/data_annotated/00000104.json

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examples/video_annotation/data_dataset_voc/class_names.txt

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+_background_
+car
+track

examples/video_annotation/labelme2voc.py

@@ -0,0 +1 @@
+../semantic_segmentation/labelme2voc.py

examples/video_annotation/labels.txt

@@ -0,0 +1,4 @@
+__ignore__
+_background_
+car
+track