Patched (temporarily) the DocC documentation (#8)

This PR contains the work done to:
* Documented the public properties, initializers, and/or functions of those types conforming to the `APIClient`, `KeyNameFilter`, and `KeyNameModel` protocols, to fix the issue that the protocol documentations cannot be inherited;
* Moved the `AmiiboService` DocC documentation catalog inside the library target;
* Amended the folder structure of the library and test targets;
* Fixed further documentation issues encountered while revising the written documentation;
* Added the `lib-test` task in the `Makefile` file;
* Improved the naming for the existing tasks in the `Makefile` file.

Reviewed-on: #8
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Sources/AmiiboService/Catalogs/AmiiboService.docc/Library.md

@@ -0,0 +1,82 @@
+# ``AmiiboService``
+
+A library that provides everything the developer needs to interacts with the **Amiibo API** backend service.
+
+## Overview
+
+The `AmiiboService` library is a Swift Package Manager package dependency aims at allowing the developer to interact with the [Amiibo API](https://www.amiiboapi.com) backend service seamlessly, by not only providing the *service* type but also any possible *clients*, *models*, *filters* and *errors* types that might be needed during implementation.
+
+## Design
+
+Although it could have been possible to generate a one-to-one RESTful client based on the Open API specification document that describe the available endpoints of the backend service, it was decided to design a `AmiiboService` service type that removes the complexities of the API design imposed by the backend service, and provides the developer with a simple interface, and a seamless experience.
+
+## Installation
+
+To use the `AmiiboService` library with your package, then add it as a dependency in the `Package.swift` file:
+
+```swift
+let package = Package(
+    // name, platforms, products, etc.
+    dependencies: [
+        .package(url: "https://github.com/rock-n-code/amiibo-service", from: "1.0.0"),
+        // other dependencies
+    ],
+    targets: [
+        .target(
+            name: "SomeTarget", 
+            dependencies: [
+                .product(name: "AmiiboService", package: "amiibo-service"),
+            ]
+        )
+        // other targets
+    ]
+)
+```
+
+It is also possible to use the `AmiiboService` library with your app in Xcode, then add it as a dependency in your Xcode project.
+
+> important: Swift 5.9 or higher is required in order to compile this library.
+
+## Tasks
+
+This library offers a set of ready-to-use project management tasks that the developer could use from the command line. To show the list of tasks on the `Terminal` app, plus display some explanations about each and every one of them; please enter the following command:
+
+```bash
+$ make
+```
+
+## Topics
+
+### Service
+
+- ``AmiiboService``
+
+### Clients
+
+- ``AmiiboClient``
+- ``AmiiboLiveClient``
+- ``AmiiboMockClient``
+
+### Models
+
+- ``Amiibo``
+- ``Amiibo/Game``
+- ``Amiibo/Platform``
+- ``Amiibo/Release``
+- ``Amiibo/Usage``
+- ``AmiiboSeries``
+- ``AmiiboType``
+- ``GameCharacter``
+- ``GameSeries``
+
+### Filters
+
+- ``AmiiboFilter``
+- ``AmiiboSeriesFilter``
+- ``AmiiboTypeFilter``
+- ``GameCharacterFilter``
+- ``GameSeriesFilter``
+
+### Errors
+
+- ``AmiiboServiceError``