Create FUNDING.md

FUNDING.md

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+:warning:
+**This package needs your support to stay maintained.** If you work for an organization
+whose website is better off using react-onclickoutside than rolling its own code
+solution, please consider talking to your manager to help fund this project.
+
+Open Source is free to use, but certainly not free to develop. If you have the
+means to reward those whose work you rely on, please consider doing so.
+:warning:
+
+If you wish to help keep this library maintained through a financial contribution,
+please visit the [Paypal donation page](https://www.paypal.com/donate/?cmd=_s-xclick&hosted_button_id=QPRDLNGDANJSW),
+and send me an email if you want me to know your contribution was specifically
+for this library.
+
+Thank you,
+
+- Pomax