add english version

en/code/src/apps/ch.2.3/basic_functions/main.go

@@ -0,0 +1,26 @@
+// Example code for Chapter 2.3 from "Build Web Application with Golang"
+// Purpose: Creating a basic function
+package main
+
+import "fmt"
+
+// return greater value between a and b
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func main() {
+	x := 3
+	y := 4
+	z := 5
+
+	max_xy := max(x, y) // call function max(x, y)
+	max_xz := max(x, z) // call function max(x, z)
+
+	fmt.Printf("max(%d, %d) = %d\n", x, y, max_xy)
+	fmt.Printf("max(%d, %d) = %d\n", x, z, max_xz)
+	fmt.Printf("max(%d, %d) = %d\n", y, z, max(y, z)) // call function here
+}