Add sponsors

Author: rmcdaniel

docs/sponsors.md

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+---
+sidebar_position: 12
+---
+
+# Sponsors
+
+Laravel Workflow is sustained by the community via sponsors and volunteers. If Laravel Workflow has been useful to you, consider supporting its ongoing development.
+
+- [Freispace Resource Scheduling](https://freispace.com)
+- [Hugo Cox](https://github.com/hnccox)