add: printf exercises

07-printf/exercises/05-double-quotes/main.go

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+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+// ---------------------------------------------------------
+// EXERCISE: Double Quotes
+//
+//  Print "hello world" with double-quotes using Printf
+//  (As you see here)
+//
+// NOTE
+//  Output "shouldn't" be just: hello world
+//
+// EXPECTED OUTPUT
+//  "hello world"
+// ---------------------------------------------------------
+
+func main() {
+	// ?
+}