Update README.md

Author: mrholek

README.md

@@ -154,13 +154,45 @@ Get updates on CoreUI's development and chat with the project maintainers and co
 - Follow [@core_ui on Twitter](https://twitter.com/core_ui).
 - Read and subscribe to [CoreUI Blog](https://coreui.io/blog/).
 
-## Copyright and license
-
-copyright 2022 creativeLabs Łukasz Holeczek. Code released under [the MIT license](https://github.com/coreui/coreui-free-bootstrap-admin-template/blob/main/LICENSE).
-There is only one limitation you can't can’t re-distribute the CoreUI as stock. You can’t do this if you modify the CoreUI. In past we faced some problems with persons who tried to sell CoreUI based templates.
-
 ## Support CoreUI Development
 
 CoreUI is an MIT licensed open source project and completely free to use. However, the amount of effort needed to maintain and develop new features for the project is not sustainable without proper financial backing. You can support development by buying [CoreUI Pro Version](https://coreui.io/pro/).
 
-We're also open to conversations regarding custom sponsorship / consulting arrangements. Get in touch on [Twitter](https://twitter.com/lukaszholeczek).
+<!--- StartOpenCollectiveBackers -->
+
+### Platinum Sponsors
+
+Support this project by [becoming a Platinum Sponsor](https://opencollective.com/coreui/contribute/platinum-sponsor-40959/). A large company logo will be added here with a link to your website.
+
+<a href="https://opencollective.com/coreui/contribute/platinum-sponsor-40959/checkout"><img src="https://opencollective.com/coreui/tiers/platinum-sponsor/0/avatar.svg?avatarHeight=100"></a>
+
+### Gold Sponsors
+
+Support this project by [becoming a Gold Sponsor](https://opencollective.com/coreui/contribute/gold-sponsor-40960/). A big company logo will be added here with a link to your website.
+
+<a href="https://opencollective.com/coreui/contribute/gold-sponsor-40960/checkout"><img src="https://opencollective.com/coreui/tiers/gold-sponsor/0/avatar.svg?avatarHeight=100"></a> 
+
+### Silver Sponsors
+
+Support this project by [becoming a Silver Sponsor](https://opencollective.com/coreui/contribute/silver-sponsor-40967/). A medium company logo will be added here with a link to your website.
+
+<a href="https://opencollective.com/coreui/contribute/silver-sponsor-40967/checkout"><img src="https://opencollective.com/coreui/tiers/gold-sponsor/0/avatar.svg?avatarHeight=100"></a>
+
+### Bronze Sponsors
+
+Support this project by [becoming a Bronze Sponsor](https://opencollective.com/coreui/contribute/bronze-sponsor-40966/). The company avatar will show up here with a link to your OpenCollective Profile.
+
+<a href="https://opencollective.com/coreui/contribute/bronze-sponsor-40966/checkout"><img src="https://opencollective.com/coreui/tiers/bronze-sponsor/0/avatar.svg?avatarHeight=100"></a> 
+
+### Backers
+
+Thanks to all the backers and sponsors! Support this project by [becoming a backer](https://opencollective.com/coreui/contribute/backer-40965/).
+
+<a href="https://opencollective.com/coreui/contribute/backer-40965/checkout" target="_blank" rel="noopener"><img src="https://opencollective.com/coreui/backers.svg?width=890"></a>
+
+<!--- EndOpenCollectiveBackers -->
+
+## Copyright and license
+
+copyright 2022 creativeLabs Łukasz Holeczek. Code released under [the MIT license](https://github.com/coreui/coreui-free-bootstrap-admin-template/blob/main/LICENSE).
+There is only one limitation you can't can’t re-distribute the CoreUI as stock. You can’t do this if you modify the CoreUI. In past we faced some problems with persons who tried to sell CoreUI based templates.