added Error function

error.go

@@ -0,0 +1,14 @@
+package main
+
+import (
+	"os"
+
+	"github.com/pterm/pterm"
+)
+
+func Error(err error) {
+	if err != nil {
+		pterm.Error.Println(err)
+		os.Exit(1)
+	}
+}