Add alamofire lib and rewrite network services

[TonioMacaronio]

Current behavior:
Now it is native URLSession used to load some data and interact with APIs.

Expected behavior:
Add Alamofire lib and rewrite URLSessions with Alamofire.

Suggested solution:
You can add Alamofire lib via CocoaPods.
All networking should be the separate class, that has functions with required parameters and do all the work by Alamofire.

Acceptance Criteria:
The code is written in new branch named feature/Alamofire or something like that.
The code implements the targets described above.
The code can be merged into the develop branch without conflicts.

Required Skill:
Participants needs to have a bit of experience in Swift software development.

[RommelTJ]

Started work on this via #25.

[RommelTJ]

PR #25 is merged, so I'll open a new PR in the future for the remaining work. Thanks @BaldyAsh!