spm: complex refactor, document of package

SideStoreApp/Tests/SideStoreSharedTests/SideStoreSharedTests.swift

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+//
+//  SideStoreSharedTests.swift
+//  SideStore
+//
+//  Created by Joseph Mattiello on 2/28/23.
+//  Copyright © 2023 Joseph Mattiello. All rights reserved.
+//
+
+import XCTest
+@testable import SideStoreShared
+
+class SideStoreSharedTests: XCTestCase {
+    override func setUp() {
+        super.setUp()
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+        super.tearDown()
+    }
+
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    }
+
+    func testPerformanceExample() {
+        // This is an example of a performance test case.
+        measure {
+            // Put the code you want to measure the time of here.
+        }
+    }
+}