Add sponsorship to README (#2059)

- Add a sponsorship section to the README.
- Thank @aws for their sponsorship.
- Add `.github/FUNDING.yml` file.
- Update to latest eShop repository URL.

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: [martincostello]

README.md

@@ -471,7 +471,15 @@ To learn more about Polly, visit [pollydocs.org][polly-docs].
 
 - [Samples](samples/README.md): Samples in this repository that serve as an introduction to Polly.
 - [Polly-Samples](https://github.com/App-vNext/Polly-Samples): Contains practical examples for using various implementations of Polly. Please feel free to contribute to the Polly-Samples repository in order to assist others who are either learning Polly for the first time, or are seeking advanced examples and novel approaches provided by our generous community.
-- Microsoft's [eShopOnContainers project](https://github.com/dotnet-architecture/eShopOnContainers): Sample project demonstrating a .NET Micro-services architecture and using Polly for resilience.
+- Microsoft's [eShopOnContainers project](https://github.com/dotnet/eShop): Sample project demonstrating a .NET Micro-services architecture and using Polly for resilience.
+
+## Sponsors
+
+Thanks to the [.NET on AWS Open Source Software Fund](https://github.com/aws/dotnet-foss) for sponsoring the ongoing development of Polly.
+
+![AWS logo](./logos/aws.png)
+
+Help support this project by becoming a sponsor through [GitHub Sponsors](https://github.com/sponsors/martincostello).
 
 ## License