As a PLAYER I want to convert my step count into my char's hp so that my exercise can be converted into game actions

[chektien]

1. have a formula to map steps to HP (start with 1 step translate to 0.001 HP)
2. draw a standard looking red bar on the screen with maxLength mapped to numeric HP (1..100)
3. If HP == maxHP, and more steps recorded, then nothing happens for now (consider adding currency system in the future)

Acceptance:

• see HP (numeric 1..100) increase as I take steps with the phone
• see HP reflected as a visual bar on the screen
• tested in real mobile app by @jentychou-sit