Apply SOLID principle at Door code example

[tonicospinelli]

Many examples on the internet of software engineering didn't apply
the SOLID principle correctly. Considering the Doors could be made
in many kinds of materials, it sounds more like an Abstract class.

The changes there introduced will be explained over the SOLID
principle:

• A Measurable Interface is a behavior expected for all objects which
  have dimensions, fitting to the Interface Segregation Principle.
• Abstract Door has dimensions and requires a material to be built.
  It is a requirement for the Single Responsibility Principle.
• Wooden Door is the concrete implementation over Door abstraction
  where defines its material and dimensions. This is an example of the
  Open/Close Principle.

[tonicospinelli]

thanks to create this repo, here is my quick and humble contribution.

[abdallahisham]

@tonicospinelli great participation, but one notice
I think you breaked one of SOLID principles -which is Dependancy Inversion- when you set material within the constructor, better set it when calling the make door

[tonicospinelli]

@abdallahisham, I understand your point. You are probably looking at the code on the SOLID principles aspects. I invite you to look at the code on the Object-Oriented approach. The Door is an abstract object with measures, and the WoodenDoor is a concrete object that never will be a MetalDoor. Now, does it make sense?