docs: Add Android release build troubleshooting section

[BSchindeleAnother]

This PR adds up documentation to set up the necessary proguard exception for release builds to work on android, as proposed in #76.

[niclasEX]

@BSchindeleAnother
What are your thoughts on #133 #129
Is there a reason not to do it with consumer rules?

[niclasEX]

If this is to be added to the documentation it might make sense to also include documentation for kotlin:

buildTypes {
    release {
        {... existing lines ...}
        isMinifyEnabled = true
        isShrinkResources = true
        proguardFiles(
            getDefaultProguardFile("proguard-android-optimize.txt"),
            "proguard-rules.pro"
        )
    }
}

[sk3llo]

@BSchindeleAnother thank you for this PR, but there is a specific section in Wiki with the common bugfixes that files this case

[niclasEX]

Does it not make sense to include the ProGuard rules in this project. Or is there any drawback when doing this?
The current workflow is: Depend on this package, run into a bug, find the wiki, apply the fix. This can take quite a lot of time as the error only occurs in release builds and only on android. And the error output is not very descriptive, so it might take quite some time.