feat: Added changelog for 2.0.0 release.

CHANGELOG.md

@@ -1,3 +1,41 @@
+## 2.0.0
+
+* The structure of files and folders has been refactored.
+* Added mason.
+* The localization setting has been fixed.
+* The flutter version has been raised.
+* A guide on using SurfGen has been written.
+* An example of a basic API call has been implemented.
+* Outdated CI/CD scripts have been removed.
+* The basic UI kit is implemented.
+* Updated package versions.
+* The assets directory has been refactored.
+* Exports have been removed.
+* The basic application icon and splash have been changed.
+* elementary_helper has been removed.
+* The features directory has been refactored.
+* Added an entry point to the feature.
+* The navigation structure has been refactored.
+* A diagram of the recommended architecture has been added to the documentation.
+* The folders "Shared", "shared" and "core" are allocated.
+* Added a pattern for catching errors.
+* LocalizationMixin added.
+* The basic Converter class has been added.
+* Info, dash, temp features have been removed.
+* Updated line length by 120 characters.
+* Added instructions for setting the app name.
+* Added a common error handler.
+* All lines are translated into English.
+* Added dcm presets to the template project.
+* Updated templates for SurfGen.
+* Application initialization has been updated.
+* Replaced ThemeService with InheritedWidget.
+* Actualized flavors and build types.
+* The Debug screen has been refactored.
+* Updated instructions for using flutterfire.
+* Added the union_state package.
+
+
 ## Unreleased
 
 * [JIRA-124](https://jira.surfstudio.ru/browse/JIRA-124) feat: Change application icons.