Adds code for showing Scaffold and Position Indicator

[kul3r4]

In preparation of removing code for rotary, this PR adds a small sample just to show how to use Scaffold and position indicator.

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• wear/src/main/java/com/example/wear/snippets/rotary/Rotary.kt:247, tag android_wear_rotary_position_indicator

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