Add README

README.md

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+<table align="center"><tr><td align="center" width="9999">
+<img src="https://download.cdn.yandex.net/from/yandex.ru/support/ru/music/files/icon_main.png" align="center" alt="Project icon" height="150">
+
+  <h1 style="margin:-30px auto auto auto">YandexMusicResolver</h1>
+
+A library aimed at searching, resolving and getting direct links to tracks, playlists or albums in Yandex.Music. Can work without authorization.
+</td></tr>
+</table>
+
+## Getting started
+
+<ol type="1">
+
+<li>
+
+Add [nuget package](https://www.nuget.org/packages/YandexMusicResolver/) to your project:
+
+```
+dotnet add package YandexMusicResolver
+```
+or
+```
+Install-Package YandexMusicResolver -Version 2.0.0
+```
+</li>
+
+<li>
+
+Create configuration instance (`FileYandexConfig` this is the default implementation to save the config to a file)  :
+
+```c#
+var config = new FileYandexConfig("path to store config");
+```
+or use empty config (if you don't want save anything):
+```c#
+var config = new EmptyYandexConfig();
+```
+After that call `Load` to load config:
+```c#
+config.Load();
+```
+</li>
+
+<li>
+
+Create an instance of `YandexMusicMainResolver` and pass config to it
+```c#
+var yandexMusicMainResolver = new YandexMusicMainResolver(config);
+```
+After that we can use `YandexMusicMainResolver` methods and other loaders methods.
+</li>
+
+</ol>
+
+Example code for getting direct track download url:
+```c#
+var fileYandexConfig = new FileYandexConfig("yandex.config");
+fileYandexConfig.Load();
+var yandexMusicMainResolver = new YandexMusicMainResolver(fileYandexConfig);
+var directUrl = await yandexMusicMainResolver.DirectUrlLoader.GetDirectUrl("55561798", "mp3");
+Console.WriteLine(directUrl);
+```
+**Warn:** Yandex will return a link to a 30-seconds track if you do not log in (do not use a config with a valid token).
+
+Methods to assist with authorization can be found in `YandexMusicAuth`.
+
+For additional examples you can take a look at unit test project.