Add sample app for haptic assessment.

Fix: 157889698
Test: N/A
Change-Id: Iff2cf51e779b9e016f50080cdac0da90c6ffce38
diff --git a/samples/demo/haptic-assessment/README.txt b/samples/demo/haptic-assessment/README.txt
new file mode 100644
index 0000000..8b84cd8
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+++ b/samples/demo/haptic-assessment/README.txt
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+README
+======
+
+This haptic assessment sample app allows the user to play with three different
+types of VibrationEffects:
+
+1) Predefined click effect with default strength.
+
+2) One shot vibration with 20ms duration at max amplitude.
+
+3) Waveform vibration with 500ms duration at half amplitude, then 500ms duration
+   at max amplitude. This will pass if the device supports vibration amplitude
+   control, and visibly fail otherwise.