Prepared for first release

- Creating db file in home dir or DB_FILE env variable
- Updated README with usages details
- Added GIF screencast

repository/storm/task.go

@@ -64,5 +64,5 @@ func (t *taskRepository) UpdateField(task *model.Task, field string, value inter
 }
 
 func (t *taskRepository) Delete(task *model.Task) error {
-	panic("implement me")
+	return t.DB.DeleteStruct(task)
 }