Add project files.

.gitignore

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+obj/
+bin/

App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+	<AutoGenerateBindingRedirects>false</AutoGenerateBindingRedirects>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

App.xaml

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+<Application x:Class="BedrockLauncher.Installer.App"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:bl="clr-namespace:BedrockLauncher.Installer.Language"
+             xmlns:local="clr-namespace:BedrockLauncher.Installer"
+             StartupUri="MainWindow.xaml">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <bl:LanguageDictionary Source="/BedrockLauncher.Installer;component/Resources/lang/lang.en-US.xaml"></bl:LanguageDictionary>
+                <ResourceDictionary Source="Resources/styles/style.xaml"/>
+                <ResourceDictionary Source="Resources/styles/button.xaml"/>
+                <ResourceDictionary Source="Resources/styles/checkbox.xaml"/>
+                <ResourceDictionary Source="Resources/styles/radiobutton.xaml"/>
+                <ResourceDictionary Source="Resources/styles/combobox.xaml"/>
+                <ResourceDictionary Source="Resources/styles/contextmenu.xaml"/>
+                <ResourceDictionary Source="Resources/styles/menuitems.xaml"/>
+                <ResourceDictionary Source="Resources/styles/listview.xaml"/>
+                <ResourceDictionary Source="Resources/styles/textbox.xaml"/>
+                <ResourceDictionary Source="Resources/styles/textblock.xaml"/>
+                <ResourceDictionary Source="Resources/styles/frame.xaml"/>
+                <ResourceDictionary Source="Resources/styles/scrollbars.xaml"/>
+                <ResourceDictionary Source="Resources/styles/tabbar.xaml"/>
+                <ResourceDictionary Source="Resources/styles/expander.xaml"/>
+                <ResourceDictionary Source="Resources/styles/richtextbox.xaml"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

App.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace BedrockLauncher.Installer
+{
+    /// <summary>
+    /// Логика взаимодействия для App.xaml
+    /// </summary>
+    public partial class App : Application
+    {
+        public App()
+        {
+            BedrockLauncher.Installer.Language.LanguageManager.Init();
+        }
+    }
+}