Add show results

README.md

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 ## Desription
 
 An image decode operator implementation with OpenCV.
 
 
 
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 ## Code Example
 
 Load a image from path './dog.jpg'. 
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   .show()
 ```
 
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 ## Factory Constructor
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 ## Interface
 
 An image decode operator takes an image path as input. It decodes the image back to ndarray.