Add Sepia Search to misc/search

Watchlist-for-ActivityPub-developer-resources.md

@@ -11,6 +11,7 @@
   - [Utilities](#utilities)
   - [Testing](#testing)
 - [Miscellaneous projects](#miscellaneous-projects)
+  - [Search](#search)
   - [Social sharing](#social-sharing)
   - [Other projects](#other-projects)
 - [Reference material](#reference-material)
@@ -151,6 +152,10 @@
 
 This category is for any code project related to the Fediverse. They need not be directly development related.
 
+#### Search
+
+* :black_nib: [**Sepia Search**](https://framagit.org/framasoft/peertube/search-index/) ([site](https://sepiasearch.org/)): A search engine of PeerTube videos and channels Developed by Framasoft `AGPL-3.0, Typescript`
+
 #### Social sharing
 
 * :heavy_check_mark: [**Share Buttons**](https://git.fsfe.org/FSFE/share-buttons): Share buttons that support dynamic input of Fediverse URLs and require no Javascript. `AGPL-3,0, PHP`