Add sponsors

.github/FUNDING.yml

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+custom: [https://github.com/PyThaiNLP/pythainlp/blob/dev/SPONSORS.md]

README.md

@@ -220,6 +220,10 @@ with this BibTeX entry:
 }
 ```
 
+## Sponsors
+
+See [SPONSORS.md](https://github.com/PyThaiNLP/pythainlp/blob/dev/SPONSORS.md)
+
 ## Acknowledgements
 
 PyThaiNLP was founded by Wannaphong Phatthiyaphaibun in 2016.
@@ -258,9 +262,6 @@ native support for Apple Silicon runners.
 [nlp-chula]: https://attapol.github.io/lab.html
 [macstadium]: https://www.macstadium.com/
 
-![VISTEC-depa Thailand AI Research Institute](./docs/images/airesearch-logo.png)
-![MacStadium](./docs/images/macstadium-logo.png)
-
 We have only one official repository at
 <https://github.com/PyThaiNLP/pythainlp>
 and another mirror at

SPONSORS.md

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+# Sponsors
+
+Current PyThaiNLP remains an independent community with no affiliation
+with any organization.
+We don't have a Patreon or GitHub sponsor for the organization.
+
+However, some development leads have GitHub sponsors.
+You can sponsor them to help make an open-source project.
+
+- [bact](https://github.com/sponsors/bact)
+- [wannaphong](https://github.com/sponsors/wannaphong)
+
+And you can sponsor by [contributing to PyThaiNLP](https://github.com/PyThaiNLP/pythainlp/blob/dev/CONTRIBUTING.md)!