housekeeping: added opencollective to system.reactive (#476)

README.md

@@ -115,3 +115,87 @@ This project has adopted a code of conduct adapted from the [Contributor Covenan
 
 This project is part of the [.NET Foundation](http://www.dotnetfoundation.org/projects) along with other
 projects like [the class libraries for .NET Core](https://github.com/dotnet/corefx/).
+
+
+<h2 align="center">Sponsorship</h2>
+
+The core team members, System.Reactive contributors and contributors in the ecosystem do this open source work in their free time. If you use System.Reactive for serious tasks, and you'd like us to invest more time on it, please donate. This project increases your income/productivity too. It makes development and applications faster and it reduces the required bandwidth.
+
+This is how we use the donations:
+
+* Allow the core team to work on System.Reactive
+* Thank contributors if they invested a large amount of time in contributing
+* Support projects in the ecosystem that are of great value for users
+* Support projects that are voted most (work in progress)
+* Infrastructure cost
+* Fees for money handling
+
+<h2 align="center">Backers</h2>
+
+[Become a backer](https://opencollective.com/reactiveui#backer) and get your image on our README on Github with a link to your site.
+
+<a href="https://opencollective.com/reactiveui/backer/0/website" target="_blank"><img src="https://opencollective.com/reactiveui/backer/0/avatar.svg"></a>
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+
+<h2 align="center">Sponsors</h2>
+
+[Become a sponsor](https://opencollective.com/reactiveui#sponsor) and get your logo on our README on Github with a link to your site.
+
+<a href="https://opencollective.com/reactiveui/sponsor/0/website" target="_blank"><img src="https://opencollective.com/reactiveui/sponsor/0/avatar.svg"></a>
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