Update README.md

Contributions...?

Author: John Troony

README.md

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+Contributing
+============
+To contribute other shells not listed here... Fork, Push the changes to your repo, then before you request for a Pull, make sure to include a simple description of your **php** web-shell and include a screen-shot of the web-shell (in your as hosted in your localhost).
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 php-webshells
 =============