Updated CONTRIBUTING.md (optional)

Author: Relequestual

CONTRIBUTING.md

@@ -43,3 +43,39 @@ As an informative document, bugs in the meta-schema may be fixed in place to ali
 ## Conduct
 
 All official channels including the mailing list, GitHub organization, and Freenode channel, follow the IETF Guidelines for Conduct as specified in [RFC7154](https://tools.ietf.org/html/rfc7154).
+
+
+## Financial contributions
+
+We also welcome financial contributions in full transparency on our [open collective](https://opencollective.com/json-schema).
+Anyone can file an expense. If the expense makes sense for the development of the community, it will be "merged" in the ledger of our open collective by the core contributors and the person who filed the expense will be reimbursed.
+
+## Credits
+
+### Code Contributors
+
+This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+<a href="https://github.com/json-schema-org/json-schema-spec/graphs/contributors"><img src="https://opencollective.com/json-schema/contributors.svg?width=890&button=false" /></a>
+
+### Financial Contributors
+
+Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/json-schema/contribute)]
+
+#### Individuals
+
+<a href="https://opencollective.com/json-schema"><img src="https://opencollective.com/json-schema/individuals.svg?width=890"></a>
+
+#### Organizations
+
+Support this project with your organization. Your logo will show up here with a link to your website. [[Contribute](https://opencollective.com/json-schema/contribute)]
+
+<a href="https://opencollective.com/json-schema/organization/0/website"><img src="https://opencollective.com/json-schema/organization/0/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/1/website"><img src="https://opencollective.com/json-schema/organization/1/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/2/website"><img src="https://opencollective.com/json-schema/organization/2/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/3/website"><img src="https://opencollective.com/json-schema/organization/3/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/4/website"><img src="https://opencollective.com/json-schema/organization/4/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/5/website"><img src="https://opencollective.com/json-schema/organization/5/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/6/website"><img src="https://opencollective.com/json-schema/organization/6/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/7/website"><img src="https://opencollective.com/json-schema/organization/7/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/8/website"><img src="https://opencollective.com/json-schema/organization/8/avatar.svg"></a>
+<a href="https://opencollective.com/json-schema/organization/9/website"><img src="https://opencollective.com/json-schema/organization/9/avatar.svg"></a>