Self-hosted web frontend for FreshRSS (Google Reader API), as discussed in #8917. (#8921)

Changes proposed in this pull request:

- Add FriRSS to the list of compatible clients (APIs & native apps table) in the README.

How to test the feature manually:

1. Render the README and check the new FriRSS row displays correctly in the table.
2. FriRSS itself (a working GReader client): https://github.com/Fripix/frirss

Pull request checklist:

- [x] clear commit messages
- [ ] code manually tested (N/A — documentation only)
- [ ] unit tests written (N/A — documentation only)
- [x] documentation updated

README.fr.md

@@ -273,6 +273,7 @@ et [l’API Fever](https://freshrss.github.io/FreshRSS/fr/users/06_Fever_API.htm
 | [Your News](https://yournews.app/)                                                    | Android, iOS| –                                                            | ✓✓                   | GReader          | –            | ⭐       | ✓                             | ✓                  | ✓        | –     | –      | –        |
 | [Fluent Reader Lite](https://hyliu.me/fluent-reader-lite/)                            | Android, iOS| [✓](https://github.com/yang991178/fluent-reader-lite)        | ✓                     | GReader          | ✓            | ⭐⭐      | –                             | –                  | ✓         | –     | –       | –           |
 | [FeedFlow](https://www.feedflow.dev)                                                  | Android, iOS, Linux, macOS, Windows | [✓](https://github.com/prof18/feed-flow)                     | ✓✓                   | GReader          | ✓            | ?        | ?                             | ?                  | ✓         | ?     | –       | ✓           |
+| [FriRSS](https://github.com/Fripix/frirss)                                            | Web (self-hosted) | [✓](https://github.com/Fripix/frirss)                        | ✓✓                   | GReader          | –            | ?        | ✓                             | ✓                  | ✓         | ✓     | –       | ✓           |
 
 | App                                                                                   | Plateforme  | Logiciel libre                                                | Maintenu & Dévelopé    | API              | Mode hors-ligne | Sync rapide | Récupère plus d’articles dans les vues individuelles | Récupère les articles lus | Favoris  | Étiquettes | Podcasts | Gestion des flux |
 |:--------------------------------------------------------------------------------------|:-----------:|:-------------------------------------------------------------:|:----------------------:|:----------------:|:-------------:|:---------:|:------------------------------:|:-------------------:|:----------:|:------:|:--------:|:------------:|