Swift package manager support

[lvnkmn]

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Description

Description of the bug or feature request and why it's a problem. Consider including:

• The use case or overall problem you're trying to solve
• Information about when the problem started

Prerequisites

[ x ] I have read the Auth0 general contribution guidelines.

[ x ] I have read the Auth0 Code of Conduct.

[ x ] I have checked the Auth0 Community for related posts.

[ x ] I have checked for related or duplicate Issues and PRs.

Environment

Please provide the following:

• Version of SimpleKeychain used: 0.9.0
• Version of OS used: iOS 13
• Additional dependencies that might be relevant:
• If using Carthage or CocoaPods, please include your Cartfile or Podfile
• Xcode version: 11

Reproduction

• this is not a bug, just a feature request

Feature request

Support for Swift package manager would be great, since Xcode now treats Swift Packages as a first class citizen.

[eaceto]

SimpleKeychain is an ObjC project. I think adding SPM would need first a Objective-C bridging header. And I really don't know if that is possible up to now (or the entire SimpleKeychain should be migrated to Swift first).

If, using ObjC is possible, then adding SPM should be as simple as adding a Package.swift file with

import PackageDescription

let package = Package(name: "SimpleKeychain",
                      platforms: [.macOS(.v10_11),
                                  .iOS(.v9),
                                  .tvOS(.v9),
                                  .watchOS(.v2)],
                      products: [.library(name: "SimpleKeychain",
                                          targets: ["SimpleKeychain"])],
                      targets: [.target(name: "SimpleKeychain",
                                        path: "SimpleKeychain")])

[Widcket]

Closed by #75.