mec07: Add my own main.go

Change-Id: Ic074173a24c46f8a36422b25e283e73a99c21b17
Reviewed-on: https://go-review.googlesource.com/127511
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>

mec07/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello world")
+}