Added example of Collatz conjecture on golang

examples/golang/collatzconjecture.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+//	"time"
+)
+
+func collatzSequence(x int) {
+//	fmt.Printf("Collatz sequence for %d\n: ", n)
+	n := x
+	for n != 1 {
+//		fmt.Printf("%d ", n)
+		if n % 2 == 0 {
+			n = n / 2
+		} else {
+			n = 3 * n + 1
+		}
+	}
+	fmt.Printf("Finish for %d, last num 1\n", x)
+}
+
+func main() {
+	var number int = 1000000
+	for i := number; i != 1; i-- {
+	 	go collatzSequence(i)
+	}
+}