Update README.md

README.md

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 Note: since the application implements a numerical integration method, it generates a significant CPU load. Therefore, the live wallpaper mode is not suitable for low-power devices.
 
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+<a href='https://play.google.com/store/apps/details?id=com.mkulesh.mmd&hl=en'><img alt='Get it on Google Play' src='https://play.google.com/intl/en_us/badges/images/generic/en_badge_web_generic.png' width=323 height=125/></a>
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 ## Languages
 * English
 * Russian