- strength is 100
- repairQuantity is 10
- repairThreshold is 25 (below which strength shields cannot auto repair on each Tick())
- IsRepairAble() method returns true

- test that after 1 damage of 1, the IsRepairable method returns TRUE and the strength is 99
- test that after 1 damage of 10, the IsRepairable method returns TRUE and the strength is 90
- test that after 8 damage of 10, the IsRepairable method returns FALSE and the strength is 20
- test that after 1 damage of 90, the IsRepairable method returns FALSE and the strength is 10
- test that after 1 damage of 11 followed by 1 Tick, the strength is 99

Add View-Controller-Manager scripts to allow the scene to change the model
(i.e. when user clicks button Damage 1 or Damage 10, the Damage is applied,
also if user click button Tick, if shield is not below threshold, then a repair is achieved
and the status on screen updated to refect any changes to the model values)

Note - the user sees the Strength and IsRepairable status as text, 
also as a colour circule image - 

Note - as long as you separate View from Model from Controller (so at least 3 scripts in your system),
feel free to implement how you wish
(i.e.  you don't have to follow the sample MVC-mediating controller achitecture

BUT - you must NOT make any changes to the provided Model class ....

HINTS for image of strength: 
Use a UI RawImage, have a public array of Textures passed to the view (as well as reference to UI RawImage)
if strength > 90 show image 100, else if > 80 show image 080 ... else if > 1 show 010, else show image 000
the texture property of the RawImage is set to the appropriate image texture