Add grpc-swift to language list (#28743)

Swift doesn't seem to be on this "front page" list, but development is vibrant and seems officially supported.
grpc · Feb 8, 2022 · dacf3ec · dacf3ec
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diff --git a/README.md b/README.md
@@ -101,3 +101,4 @@ seeking contributions for all of these libraries:
 | WebJS                | [grpc-web](https://github.com/grpc/grpc-web)       |
 | Dart                 | [grpc-dart](https://github.com/grpc/grpc-dart)     |
 | .NET (pure C# impl.) | [grpc-dotnet](https://github.com/grpc/grpc-dotnet) |
+| Swift                | [grpc-swift](https://github.com/grpc/grpc-swift) |