Improvement - mention bot to ask Pl@ntNet id.

[boly38]

Suppose you see a post (A) with a flower.

You want a Pl@ntNet identification for this flower.

• reply to this post (rA) with "@botEnSky" mention,
• then the bot must detect this reply ( rA )
• bot must do an (A's image) identification
• bot must post result as reply to (rA)

[boly38]

• [x] add an example to work on : ✅ done