add(taskwarrior): update tasks in taskwarrior

The implementation updates the tasks in taskwarrior and/or creates new
tasks. WIP for #3.

cmd/gitw/main.go

@@ -79,6 +79,16 @@ func main() {
 	}
 	fmt.Println("---")
 
+	// NOTE: this can be used to add / modify tasks
+	// var update_tasks []taskwarrior.Task
+	// task := taskwarrior.NewTask(
+	// 	"This is a test task from gitwarrior",
+	// 	"gitwarrior",
+	// 	"issue",
+	// )
+	// update_tasks = append(update_tasks, task)
+	// taskwarrior.UpdateTasks(update_tasks)
+
 	// necessary configurations (see config file gitw.json)
 	// - access code for gitea
 	// - configuration for taskwarrior settings?