Update README.md

Added some detail

Author: ThaMunsta

README.md

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 # 404
 404 Page with Random Flash
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+I just wanted my website to display a random flash file for its 404 page so I made this but it became a lot more than I expected.
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+Flash files are checked for size so iframe can display them properly. This information is cached for performance.
+Mobile devices use the same type of code but without cache or size checking. It also makes most mobile devices vibrate because why not.
+A random error message is also shown to the user to keep a fresh sarcastic feel to it.
+Download button for the currently viewed flash file. Hotlink available for those who want to send the page to a friend but show them the same flash file they saw. Font is smaller as to not distract.