Adding images to README.md

[murtezayesil]

Images are added to markdown with ![alt_text](https://url_to_image) syntax. Use link to RAW for images in your repository. Read markdown guide for more info.

![QS_ST Human](https://raw.githubusercontent.com/DFgraphics/Mayday/master/raw/graphics/QS_ST/QS_ST_MJR_human_standard_16x16.png)