Link to supported versions from README.md (#1558)

Author: bart-vmware

README.md

@@ -35,6 +35,8 @@ In addition to the [feature documentation](https://steeltoe.io/api), we have bui
 | 3.x | .NET Core 3.1 - .NET 6 |
 | 2.x | .NET Framework 4.6.1+ |
 
+For more details, see [Supported Versions on the Wiki](https://github.com/SteeltoeOSS/Steeltoe/wiki/Steeltoe-Support-Versions).
+
 ## Support and Feedback
 
 For community support, we recommend [Steeltoe OSS Slack](https://slack.steeltoe.io), [StackOverflow](https://stackoverflow.com/questions/tagged/steeltoe), or [open an issue](https://github.com/SteeltoeOSS/Steeltoe/issues/new/choose).