Update README.md

README.md

@@ -1,3 +1,41 @@
 # Leo: A toy project for learning programming.
 ![](mainwindow.png)
 ![](mainwindow.zh-CN.png)
+
+```txt
+$ tree  -L 2
+.
+念岸岸 global.json
+念岸岸 leo.sln
+念岸岸 LICENSE
+念岸岸 mainwindow.png
+念岸岸 mainwindow.zh-CN.png
+念岸岸 README.md
+念岸岸 src
+岫?? 念岸岸 Leo.Data.Domain
+岫?? 念岸岸 Leo.UI.Services
+岫?? 念岸岸 Leo.Web
+岫?? 念岸岸 Leo.Web.Api
+岫?? 念岸岸 Leo.Web.Data
+岫?? 念岸岸 Leo.Web.Data.SQLite
+岫?? 念岸岸 Leo.Web.Host
+岫?? 念岸岸 Leo.Windows.App
+岫?? 弩岸岸 Leo.Wpf.App
+弩岸岸 test
+    念岸岸 Leo.Data.Domain.Tests
+    弩岸岸 Leo.Web.Api.Tests
+
+14 directories, 6 files
+```
+
+* `Leo.Windows.App` is a WinForms-based application.
+* `Leo.Wpf.App` is a WPF-based application.
+* `Leo.Web.Host` is a ASP.NET Core application.
+
+NOTE: For simplify, the desktop application also launchs the Web API application. You can see more information at `Leo.Windows.Program.Main` and `Leo.Wpf.App.App`.
+
+When the application starts, it requires to login with a Microsoft account (an organization or personal account).
+
+![](login.png)
+
+After login succeeded, we will enter the main window. On the main window, we can create an new customer or click the `Find` menu at the toolbar to find a and load a existed customer.