Add Gradio demo gif

Author: kobiso

README.md

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 # M-LSD: Towards Light-weight and Real-time Line Segment Detection
 
-[Paper](https://arxiv.org/abs/2106.00186) | [Colab](https://colab.research.google.com/gist/geonm/16b7e4bad577511d2313bf0337029bfc/mlsd_demo.ipynb) | [PPT](https://www.slideshare.net/ByungSooKo1/towards-lightweight-and-realtime-line-segment-detection)
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-[Gradio Web Demo](https://gradio.app/g/AK391/mlsd) by [AK391](https://github.com/AK391)
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 Official Tensorflow implementation of *"M-LSD: Towards Light-weight and Real-time Line Segment Detection"*
 
 **Geonmo Gu\*, Byungsoo Ko\*, SeoungHyun Go, Sung-Hyun Lee, Jingeun Lee, Minchul Shin**
 (* Authors contributed equally.)
 
 @NAVER/LINE Vision
 
+[Paper](https://arxiv.org/abs/2106.00186) | [Colab](https://colab.research.google.com/gist/geonm/16b7e4bad577511d2313bf0337029bfc/mlsd_demo.ipynb) | [PPT](https://www.slideshare.net/ByungSooKo1/towards-lightweight-and-realtime-line-segment-detection)
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+[Gradio Web Demo](https://gradio.app/g/AK391/mlsd) by [AK391](https://github.com/AK391)
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+<img src=".github/mlsd_demo.gif" height="400">
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 ## Overview
 <p float="left">
   <img src=".github/teaser.png" height="250">