learned I didn't need git for external modules and different folders can have different mains

cmd/averageWithArgs/averageWithArgs.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+)
+
+func main() {
+	arguments := os.Args[1:]
+	var sum float64 = 0
+	for _, argument := range arguments {
+		number, err := strconv.ParseFloat(argument, 64)
+		if err != nil {
+			log.Fatal(err)
+		}
+		sum += number
+	}
+	sampleCount := float64(len(arguments))
+	fmt.Printf("Average: %0.2f\n", sum/sampleCount)
+}