[SKIP CI] URL intent filter (#5209)

* [CI SKIP] URL intent filter

* [CI SKIP] move to better location

* [CI SKIP] fix url

* Update CONTRIBUTING.md

Co-authored-by: arkon <arkon@users.noreply.github.com>

CONTRIBUTING.md

@@ -190,8 +190,6 @@ a.k.a. the Latest source entry point in the app (invoked by tapping on the "Late
     - If search functionality is not available, return `Observable.just(MangasPage(emptyList(), false))`
 - `getFilterList` will be called to get all filters and filter types. **TODO: explain more about `Filter`**
 
-
-
 #### Manga Details
 
 - When user taps on a manga, `fetchMangaDetails` and `fetchChapterList` will be called and the results will be cached.
@@ -223,6 +221,14 @@ a.k.a. the Latest source entry point in the app (invoked by tapping on the "Late
 - If possible try to stick to the general workflow from `HttpSource`/`ParsedHttpSource`; breaking them may cause you more headache than necessary.
 - By implementing `ConfigurableSource` you can add settings to your source, which is backed by [`SharedPreferences`](https://developer.android.com/reference/android/content/SharedPreferences).
 
+### Advanced Extension features
+
+#### URL intent filter
+
+Extensions can define URL intent filters by defining it inside a custom `AndroidManifest.xml` file.
+For an example, refer to [the NHentai module's `AndroidManifest.xml` file](https://github.com/tachiyomiorg/tachiyomi-extensions/blob/master/src/all/nhentai/AndroidManifest.xml) and [its corresponding `NHUrlActivity` handler](https://github.com/tachiyomiorg/tachiyomi-extensions/blob/master/src/all/nhentai/src/eu/kanade/tachiyomi/extension/all/nhentai/NHUrlActivity.kt).
+
+
 ## Running
 
 To aid in local development, you can use the following run configuration to launch an extension: