Create BACKERS.md

BACKERS.md

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+## Sponsors & Backers
+
+Tile38 is an MIT-licensed open source project.
+It's an independent project with its ongoing development made possible thanks to the support by these awesome [backers](https://github.com/tidwall/tile38/blob/master/BACKERS.md).
+If you'd like to join them, please consider:
+
+- [Become a backer or sponsor on Patreon](https://www.patreon.com/tidwall).
+
+## Backers via Patreon
+
+- Aviv Klasquin Komissar
+- Coen B
+- Melbatoast