add README

Author: rubo77

Diff for: README.md

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+# php-mysql-fix
+
+A replacement for all mysql functions with mysqli equivalents.
+
+Be aware, that this is just a workaround to fix-up some old code and the resulting project 
+will be more vulnerable than if you use the recommended newer mysqli-functions instead.
+So only If you are sure that this is not setting your server at risk, you can fix your old
+code by adding this line at the beginning of your old code:
+
+see: https://stackoverflow.com/a/37877644/1069083
+
+If you have any questions open an issue there or enhancements as Pull Request