Add mastodon-twitter-poster to Bridges

Watchlist-for-ActivityPub-developer-resources.md

@@ -130,6 +130,8 @@ For an overview of known relays, see [A sorted list of ActivityPub relays for Ma
 
 * :heavy_check_mark: [**ligh7hau5**](https://github.com/vulet/ligh7hau5): A Matrix to Fediverse / ActivityPub client / bridge. Also, some media proxying. `GPL-3.0, Javascript`
 
+* :black_nib: [**mastodon-twitter-poster**](https://github.com/renatolond/mastodon-twitter-poster) ([site](https://crossposter.masto.donte.com.br/), [Fedi account](https://masto.donte.com.br/@crossposter)): Crossposter to post statuses between Mastodon and Twitter. `AGPL-3.0, Ruby`
+
 * :heavy_check_mark: [**Moa**](https://gitlab.com/fedstoa/moa) ([site](https://moa.party/)): A Mastodon, Twitter, and Instagram Cross-poster. `MIT, Python`
 
 * :heavy_check_mark: [**MXToot**](https://github.com/ma1uta/mxtoot) ([Fedi account](https://mastodon.social/@ma1uta)): A Matrix <--> Mastodon bot written in Java. `Apache-2.0, Java`