add basic repl

main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+	"monkey/repl"
+	"os"
+	user2 "os/user"
+)
+
+func main() {
+	user, err := user2.Current()
+
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("Hello %s! This is the Monkey programmig language!\n", user.Username)
+	fmt.Printf("Feel free to type in commands\n")
+	repl.Start(os.Stdin, os.Stdout)
+}