gopls: adding the gopls module

Change-Id: I521ff33f8733a7d636b8ebc611715cb19e41bc83
Reviewed-on: https://go-review.googlesource.com/c/tools/+/181946
Reviewed-by: Rebecca Stambler <rstambler@golang.org>

gopls/go.mod

@@ -0,0 +1,7 @@
+module golang.org/x/tools/gopls
+
+go 1.11
+
+require golang.org/x/tools v0.0.0-20190612231717-10539ce30318
+
+replace golang.org/x/tools => ../

gopls/go.sum

@@ -0,0 +1,8 @@
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20190612180059-59534d075a87 h1:RZgRBvCwrKVLcEd+O/QbyISA6RAPPLTYHdPw4Nk0Wz0=
+golang.org/x/tools v0.0.0-20190612180059-59534d075a87/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=

gopls/main.go

@@ -0,0 +1,21 @@
+// Copyright 2019 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 gopls command is an LSP server for Go.
+// The Language Server Protocol allows any text editor
+// to be extended with IDE-like features;
+// see https://langserver.org/ for details.
+package main // import "golang.org/x/tools/gopls"
+
+import (
+	"context"
+	"os"
+
+	"golang.org/x/tools/internal/lsp/cmd"
+	"golang.org/x/tools/internal/tool"
+)
+
+func main() {
+	tool.Main(context.Background(), cmd.New("", nil), os.Args[1:])
+}