Merge "Add readme.md for RotaryPlayground" into rvc-dev am: 7e62da0108

Change-Id: Ic18b7fe38f1a0ea6418e035af5f6238c34d4389c
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+# Rotary Playground: Test app for rotary controller
+
+## Building
+```
+make RotaryPlayground
+```
+
+## Installing
+```
+adb install out/target/product/[hardware]/system/app/RotaryPlayground/RotaryPlayground.apk
+```
+
+## Once installed, launch Rotary Playground in the Launcher, or with this adb command:
+```
+adb shell am start -n com.android.car.rotaryplayground/com.android.car.rotaryplayground.RotaryActivity
+```
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