Mention support channels (#9)

Co-authored-by: Ingvarr Zhmakin <[email protected]>

README.md

@@ -17,3 +17,12 @@ helm upgrade --install --debug --dry-run \
      -n pspdfkit-services \
      -f ./document-engine-values.yaml
 ```
+## Support, Issues and License Questions
+
+PSPDFKit offers support for customers with an active SDK license via https://pspdfkit.com/support/request/
+
+Are you [evaluating our SDK](https://pspdfkit.com/try/)? That's great, we're happy to help out! To make sure this is fast, please use a work email and have someone from your company fill out our sales form: https://pspdfkit.com/sales/
+
+## License
+
+This software is licensed under a [modified BSD license](LICENSE)