dl: add go1.19rc1

Change-Id: I74a171f7907cc1632ef7c5ffada691f82f4e1ed6
Reviewed-on: https://go-review.googlesource.com/c/dl/+/416274
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Gopher Robot <gobot@golang.org>
Auto-Submit: Gopher Robot <gobot@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

go1.19rc1/main.go

@@ -0,0 +1,24 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// The go1.19rc1 command runs the go command from Go 1.19rc1.
+//
+// To install, run:
+//
+//	$ go install golang.org/dl/go1.19rc1@latest
+//	$ go1.19rc1 download
+//
+// And then use the go1.19rc1 command as if it were your normal go
+// command.
+//
+// See the release notes at https://tip.golang.org/doc/go1.19.
+//
+// File bugs at https://go.dev/issue/new.
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.19rc1")
+}