An attempt to bring this https://github.com/ThatCSharpGuy/Forms-FullCameraPage to .NET Standard
A detailed description of how this works can be found here Full page camera in Xamarin.Forms.
On Android add the following lines to your Manifest
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
On iOS add the follwing lines to your Info.plist (make sure you explain to your users why you need the camera)
<key>NSCameraUsageDescription</key>
<string>I need access to your camera to take some photos!</string>
The Android API that this camera uses has been deprecated a long time ago and will be removed in a future Android release. That being said, if you want to help me upgrade this example, you'll get this horrible hard shell taco 🌮 and my full appreciation.