docs: Add Doxygen and project-related documentation

core/doc/guide/apimodel-loader.md

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+\page guide-apimodel-loader ApiModel and Loaders
+\brief This will give an overview of how the ApiModel and Loaders interact.
+
+\todo
+This guide should still be written

core/doc/guide/getting-started.md

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+\page guide-getting-started Getting Started
+\brief Installation procedure and first application using this library
+
+This is a tutorial on how to use Jellyfin Qt library.
+
+## Project setup
+
+The library works as [a QML plugin](https://doc.qt.io/archives/qt-5.6/qqmlextensionplugin.html). 
+Compile the library, install it in the QML plugin path and add a qmldir file like this:
+
+```
+module nl.netsoj.chris.Jellyfin
+plugin JellyfinQt
+```
+
+You should then be able to import it in your QML files.
+
+
+```qml
+import nl.netsoj.chris.Jellyfin
+```
+
+\note
+In the documentation, the URI nl.netsoj.chris.Jellyfin will be used. 
+If you deviate from this, make sure to put the plugin in the correct location,
+as well as using the correct import statements in QML.
+
+## Hello Jellyfin!
+
+The first step for interacting with the library is setting up an \ref Jellyfin::ApiClient. 
+This object handles authentication. 
+
+
+
+\warning
+The way authentication works using ApiClient will change before the next major release to support multiple accounts! See \issue{4}
+
+Lets create an instance of ApiClient that is reachable from everywhere, by putting it in the ApplicationWindow:
+
+```qml
+import nl.netsoj.chris.Jellyfin as JF
+import QtQuick 2.0 as QQ
+
+QQ.ApplicationWindow {
+    readonly property JF.ApiClient apiClient: _apiClient
+
+    JF.ApiClient {
+        id: _apiClient
+        appName: "The name of your client"
+    }
+}
+```
+
+\note
+As an alternative, you could create a QML file only containing the ApiClient and [declaring it as a Singleton](https://doc.qt.io/archives/qt-5.6/qtqml-modules-qmldir.html#contents-of-a-module-definition-qmldir-file)
+
+## Authentication
+If the user already has logged in and the credentials are stored, this is quite easy: 
+the \ref Jellyfin::ApiClient::authenticated "authenticated" property will change to true and the corresponding signal will fire.
+You don't have to do anything else!
+
+When the user never has logged in, the signal \ref Jellyfin::ApiClient::setupRequired "setupRequired()" will be fired.
+When this happens, you should let the user enter a server URL and set it as the \ref Jellyfin::ApiClient::baseUrl "baseUrl" property.
+You can get a list model of servers in the local network using the \ref Jellyfin::ServerDiscoveryModel.
+
+After the \ref Jellyfin::ApiClient::baseUrl "baseUrl" property has been set, the slot \ref Jellyfin::ApiClient::authenticate "authenticate" should be called with an username and password.
+When authentication was successful, the property \ref Jellyfin::ApiClient::authenticated "authenticated" will be changed to true. 
+Otherwise, the signal \ref Jellyfin::ApiClient::authenticationError "authenticationError" will be fired.
+
+\note
+To show a list of available users, one can use the \ref Jellyfin::ViewModel::UserModel "UserModel" and \ref Jellyfin::ViewModel::PublicUsersLoader "PublicUsersLoader".
+However, this requires knowledge of the Loader and Model system, which will be explained in the next chapter \ref guide-apimodel-loader
+