def add(path: str, content: str, encoding: str = "utf-8") -> int:
    """
    add(path: str, content: str, encoding = "utf-8") -> int ---- Add content into file. Return amount of written symbols.
    If file doesn't exist, create it.
    """
    with open(path, "a", encoding = encoding) as file:
        size = file.write(content)
    return size