GOF: Flyweight, Front Controller, Marker

[joaorobson]

Flyweight, Front Controller, Marker GOFs and document it on GitHub pages.

Tasks:

• [ ] Study Flyweight
• [x] Study Front Controller
• [ ] Study Marker
• [ ] Analyze what we can use in our project

Acceptance Criteria:

• [ ] The document on pages explains what is each one of these GOFs
• [ ] The document explains which ones we can use in our project and why.

[RomuloSouza]

I accepted partially because it was ok, but it isn't complete yet. I believe you can finish this job @gabibguedes @aleronupe :)