Update README.md to reference grpc-swift-2 (#2247)

Author: glbrntt

README.md

@@ -3,25 +3,18 @@
 This repository contains a gRPC code generator and runtime libraries for Swift.
 You can read more about gRPC on the [gRPC project's website][grpcio].
 
-## Versions
-
-gRPC Swift is currently undergoing active development to take full advantage of
-Swift's native concurrency features. The culmination of this work will be a new
-major version, v2.x. Pre-release versions will be available in the near future.
-
-In the meantime, v1.x is available and still supported. You can read more about
-it on the [Swift Package Index][spi-grpc-swift-main].
+> [!IMPORTANT]  
+>  
+> See [grpc/grpc-swift-2](https://github.com/grpc/grpc-swift-2) for **gRPC Swift 2**
+> which is the current major version of gRPC Swift.
 
-## Support
-
-As gRPC Swift v2.x is being developed, v1.x will continue to be supported.
-However, the support window for v1.x will decrease over time as new Swift
-versions are released.
+## Versions
 
-From the next Swift release, the number of Swift versions supported by
-gRPC Swift v1.x will decrease by one each time.
+This repository contains the code for **gRPC Swift 1** which is now in maintenance 
+mode. Only bug fixes and security fixes will be applied. The support window for 
+1.x will also decrease over time as new Swift versions are released.
 
-Assuming the next Swift releases are 6.1, 6.2, 6.3, and 6.4 then the versions of
+Assuming the next Swift releases are 6.2, 6.3, and 6.4 then the versions of
 Swift supported by gRPC Swift are as follows.
 
 Swift Release | Swift versions supported by 1.x