resize images in Github

Problem: When your Take a screenshot and drag and drop the image and copy and paste it into the comment of a github issue or pull request, the image offten shows larger than expected.

Solution: You can resize the image as you like by dragging and dropping.

HowTo:
Take a screenshot and drag and drop the image and copy and paste it into the comment of a github issue or pull request, Then Add query parameters to he image URL.

- github will set a default width of 400 if no width parameter set.
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- add a width parameter to the image URL
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- add a height parameter to the image URL
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- also add a width and a height parameter to the image URL
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