Move to gopath dir and introduce new package

src/github.com/microsoft/vscode-remote-try-go/hello/hello.go

@@ -0,0 +1,8 @@
+package hello
+
+import ()
+
+// Hello writes a welcome string
+func Hello() string {
+	return "Hello golang!"
+}

src/github.com/microsoft/vscode-remote-try-go/main/server.go

@@ -0,0 +1,24 @@
+/*----------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See LICENSE in the project root for license information.
+ *---------------------------------------------------------------------------------------*/
+
+package main
+
+import (
+	"fmt"
+	"github.com/microsoft/vscode-remote-try-go/hello"
+	"io"
+	"net/http"
+)
+
+func helloOld(w http.ResponseWriter, r *http.Request) {
+	io.WriteString(w, hello.Hello())
+}
+
+func main() {
+	portNumber := "9000"
+	http.HandleFunc("/", helloOld)
+	fmt.Println("Server listening on port ", portNumber)
+	http.ListenAndServe(":"+portNumber, nil)
+}