SPM Endpoints requests

A simplified Swift library to manage gets and posts from servers.

original code from [Farina](https://github.com/PedroFarina)

This framework was built for handling gets and posts from any servers.

Get:

When in need of a get request all you have to do is one call:

EndpointsRequests.getRequest which creates a get request and can do the following:

• Add headers
• Return the answer as:
  • Given by the server
  • A decodable object
• Trigger a completion handler with its answer

Post:

When in need of a post request all you have to do is one call:

EndpointsRequests.postRequest which creates a post requests and can do the following:

• Add headers
• Add params as a:
  • Dictionary with key/value
  • Encodable object
• Return the answer as:
  • Given by the server
  • A decodable object
• Trigger a completion handler with its answer

Errors

The answers might be errors when:

• An error occurs on the server
• An invalid URL was passed as parameter
• Could not encode object as JSON