Add snippets for /training/wearables/tiles/get_started

[ithinkihaveacat]

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[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• wear/src/main/java/com/example/wear/snippets/tile/Tile.kt:263, tag android_wear_tile_get_started_modifiers
• wear/src/main/java/com/example/wear/snippets/tile/Tile.kt:279, tag android_wear_tile_get_started_spannables
• wear/src/main/java/com/example/wear/snippets/tile/Tile.kt:305, tag android_wear_tile_get_started_resources

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