Adds Wear module and voice input snippet

[kul3r4]

• Adds a Wear module
• Adds a snippet to replace outdated code in https://developer.android.com/training/wearables/user-input/voice#kotlin

[snippet-bot]

Here is the summary of changes.

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• wear/src/main/java/com/example/wear/snippets/voiceinput/VoiceInputScreen.kt:66, tag android_wear_voice_input

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[garanj]

Would this be better as a nullable string, instead of using "None"?

[riggaroo]

Needs the build scripts and spotless :) Otherwise its looking great!