add README for Setup before Tutorial can begin

README.md

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+## Getting Started
+
+Series of quick Go tutorials to show you a few things.
+
+### [Installing Go](INSTALL.md)
+
+This is a quick start guide to show you how to install Go, and write your first `Hello World` program.
+
+### [Your first Command Line Program](CLI.md)
+
+This tutorial will show you how to create a basic command line program that accepts arguments.
+
+### [Your First Webserver](HTTP.md)
+
+Learn how to spin up a web server and how to route incoming requests.
+
+### [Basic Concurrency](CONCURRENCY.md)
+
+See a couple of basic concurrency patterns.