[camerax] Add Kotlin duplicate classes known error to README.md (flutter#3957)

Adds warning about Kotlin duplicate class error to `README.md`.

Author: camsim99

packages/camera/camera_android_camerax/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.5.0+1
+
+* Update `README.md` to include known duplicate Kotlin classes issue.
+
 ## 0.5.0
 
 * Initial release of this `camera` implementation that supports:

packages/camera/camera_android_camerax/README.md

@@ -49,6 +49,15 @@ Any specified `ResolutionPreset` wll go unused in favor of CameraX defaults and
 
 `setZoomLevel` is unimplemented.
 
+## Known Issues
+
+### Receiving `Duplicate class kotlin.*` error
+
+If you receive a `Duplicate class kotlin.*` error when using this plugin
+implementation, you may need to update your app's Kotlin version. You can do
+this by finding your app's `android/build.gradle` file and updating the
+`org.jetbrains.kotlin:kotlin-stdlib-jdk7` dependency to at least version 1.18.10.
+
 ## Contributing
 
 For more information on contributing to this plugin, see [`CONTRIBUTING.md`](CONTRIBUTING.md).

packages/camera/camera_android_camerax/pubspec.yaml

@@ -3,7 +3,7 @@ description: Android implementation of the camera plugin using the CameraX libra
 repository: https://github.com/flutter/packages/tree/main/packages/camera/camera_android_camerax
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
 
-version: 0.5.0
+version: 0.5.0+1
 
 environment:
   sdk: ">=2.19.0 <4.0.0"