Function parse_markdown 

pub fn parse_markdown(text: &str) -> (String, Vec<MessageEntity>)

Parse Telegram-flavoured markdown into (plain_text, entities).

Supported syntax:

• **bold**
• __italic__
• ~~strikethrough~~
• ||spoiler||
• `inline code`
• ```lang\ncode\n```
• [text](url) or [text](tg://user?id=123)