Update exoplayer2 README to document this repo is no longer updated

PiperOrigin-RevId: 621497237
(cherry picked from commit fb5f4132b6eb2af5edb8afe8e43546183e0102a5)

README.md

@@ -12,133 +12,10 @@ future development will be in that project.
 Please refer to our [migration guide and script][] to move your codebase to the
 Media3 package names.
 
-*   We plan to continue pushing commits to the `dev-v2` branch in this
-    repository until March 2024.
+*   As of 2024-04-03 we have stopped pushing commits to the `dev-v2` branch in
+    this repository. New ExoPlayer code is available in the AndroidX Media
+    GitHub repository: https://github.com/androidx/media
 *   `exoplayer:2.19.1` was the last artifact released from this project, we
     don't plan to release any more.
 
 [migration guide and script]: https://developer.android.com/guide/topics/media/media3/getting-started/migration-guide
-
-## Documentation
-
-*   The [developer guide][] provides a wealth of information.
-*   The [class reference][] documents ExoPlayer classes. Note that the classes
-    are documented with their Media3 package names.
-*   The [release notes][] document the major changes in each release.
-*   Follow our [developer blog][] to keep up to date with the latest ExoPlayer
-    developments!
-
-[developer guide]: https://developer.android.com/guide/topics/media/exoplayer
-[class reference]: https://developer.android.com/reference/androidx/media3/common/package-summary
-[release notes]: https://github.com/google/ExoPlayer/blob/release-v2/RELEASENOTES.md
-[developer blog]: https://medium.com/google-exoplayer
-
-## Using ExoPlayer
-
-Please refer to
-[AndroidX Media](https://github.com/androidx/media/blob/release/README.md) for
-the usage instructions of the latest release.
-
-ExoPlayer modules can be obtained from [the Google Maven repository][]. It's
-also possible to clone the repository and depend on the modules locally.
-
-[the Google Maven repository]: https://developer.android.com/studio/build/dependencies#google-maven
-
-### From the Google Maven repository
-
-#### 1. Add ExoPlayer module dependencies
-
-The easiest way to get started using ExoPlayer is to add it as a gradle
-dependency in the `build.gradle` file of your app module. The following will add
-a dependency to the full library:
-
-```gradle
-implementation 'com.google.android.exoplayer:exoplayer:2.X.X'
-```
-
-where `2.X.X` is your preferred version.
-
-As an alternative to the full library, you can depend on only the library
-modules that you actually need. For example the following will add dependencies
-on the Core, DASH and UI library modules, as might be required for an app that
-only plays DASH content:
-
-```gradle
-implementation 'com.google.android.exoplayer:exoplayer-core:2.X.X'
-implementation 'com.google.android.exoplayer:exoplayer-dash:2.X.X'
-implementation 'com.google.android.exoplayer:exoplayer-ui:2.X.X'
-```
-
-When depending on individual modules they must all be the same version.
-
-The available library modules are listed below. Adding a dependency to the full
-ExoPlayer library is equivalent to adding dependencies on all of the library
-modules individually.
-
-* `exoplayer-core`: Core functionality (required).
-* `exoplayer-dash`: Support for DASH content.
-* `exoplayer-hls`: Support for HLS content.
-* `exoplayer-rtsp`: Support for RTSP content.
-* `exoplayer-smoothstreaming`: Support for SmoothStreaming content.
-* `exoplayer-transformer`: Media transformation functionality.
-* `exoplayer-ui`: UI components and resources for use with ExoPlayer.
-
-In addition to library modules, ExoPlayer has extension modules that depend on
-external libraries to provide additional functionality. Some extensions are
-available from the Maven repository, whereas others must be built manually.
-Browse the [extensions directory][] and their individual READMEs for details.
-
-More information on the library and extension modules that are available can be
-found on the [Google Maven ExoPlayer page][].
-
-[extensions directory]: https://github.com/google/ExoPlayer/tree/release-v2/extensions/
-[Google Maven ExoPlayer page]: https://maven.google.com/web/index.html#com.google.android.exoplayer
-
-#### 2. Turn on Java 8 support
-
-If not enabled already, you also need to turn on Java 8 support in all
-`build.gradle` files depending on ExoPlayer, by adding the following to the
-`android` section:
-
-```gradle
-compileOptions {
-  targetCompatibility JavaVersion.VERSION_1_8
-}
-```
-
-#### 3. Enable multidex
-
-If your Gradle `minSdkVersion` is 20 or lower, you should
-[enable multidex](https://developer.android.com/studio/build/multidex) in order
-to prevent build errors.
-
-### Locally
-
-Cloning the repository and depending on the modules locally is required when
-using some ExoPlayer extension modules. It's also a suitable approach if you
-want to make local changes to ExoPlayer, or if you want to use a development
-branch.
-
-First, clone the repository into a local directory:
-
-```sh
-git clone https://github.com/google/ExoPlayer.git
-cd ExoPlayer
-```
-
-Next, add the following to your project's `settings.gradle` file, replacing
-`path/to/exoplayer` with the path to your local copy:
-
-```gradle
-gradle.ext.exoplayerModulePrefix = 'exoplayer-'
-apply from: file("path/to/exoplayer/core_settings.gradle")
-```
-
-You should now see the ExoPlayer modules appear as part of your project. You can
-depend on them as you would on any other local module, for example:
-
-```gradle
-implementation project(':exoplayer-library-core')
-implementation project(':exoplayer-library-dash')
-implementation project(':exoplayer-library-ui')
-```