SwiftPM/Accio Support

[justingluck93]

Fixes #1229

This PR is [ready] for review.

Risk

This PR makes [no] API changes.

Testing Plan

Follow this guide https://github.com/JamitLabs/Accio to get started installing and setting up a new project with Accio

Summary

This change adds support for users to use Accio as a dependency manager in their application.

CLA

• I have signed the CLA

Example Package

// swift-tools-version:5.0
import PackageDescription

let package = Package(
    name: "Demo",
    products: [],
    dependencies: [
       .package(url: "https://github.com/smartdevicelink/sdl_ios.git", .branch("feature/issue-1229-SwiftPM")),
    ],
    targets: [
        .target(
            name: "Demo",
            dependencies: [
                "SmartDeviceLinkSwift"
            ],
            path: "Demo"
        ),
    ]
)

[joeljfischer]

This should be SmartDeviceLink

[justingluck93]

fixed!