add: for statement loop exercises

13-loops/exercises/01-sum-the-numbers/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: Sum the numbers
+//
+//  1. By using a loop, sum the numbers between 1 and 10.
+//  2. Print the sum.
+//
+// EXPECTED OUTPUT
+//  Sum: 55
+// ---------------------------------------------------------
+
+func main() {
+}

13-loops/exercises/01-sum-the-numbers/solution/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
+
+import (
+	"fmt"
+)
+
+func main() {
+	var sum int
+	for i := 1; i <= 10; i++ {
+		sum += i
+	}
+	fmt.Println("Sum:", sum)
+}