dl: add go1.15

Change-Id: Id7f2b4219f909770e8559d04d3c963e011da7630
Reviewed-on: https://go-review.googlesource.com/c/dl/+/247683
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
diff --git a/go1.15/main.go b/go1.15/main.go
new file mode 100644
index 0000000..8ef0175
--- /dev/null
+++ b/go1.15/main.go
@@ -0,0 +1,24 @@
+// Copyright 2020 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 go1.15 command runs the go command from Go 1.15.
+//
+// To install, run:
+//
+//     $ go get golang.org/dl/go1.15
+//     $ go1.15 download
+//
+// And then use the go1.15 command as if it were your normal go
+// command.
+//
+// See the release notes at https://golang.org/doc/go1.15
+//
+// File bugs at https://golang.org/issues/new
+package main
+
+import "golang.org/dl/internal/version"
+
+func main() {
+	version.Run("go1.15")
+}