docs(readme): add FlowInterops.Run usage

Author: ruattd

README.md

@@ -2,6 +2,8 @@
 
 面向现代 .NET 应用程序的轻量级生命周期与流程控制框架。
 
+*[WORKING IN PROGRESS]*
+
 [![NuGet Version](https://img.shields.io/nuget/v/FlowNet.Core?style=flat-square)](https://www.nuget.org/packages/FlowNet.Core)
 [![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/ruattd/FlowNet/ci.yml?style=flat-square&label=ci)](https://github.com/ruattd/FlowNet/actions/workflows/ci.yml)
 [![GitHub top language](https://img.shields.io/github/languages/top/ruattd/FlowNet?style=flat-square)](https://github.com/ruattd/FlowNet)
@@ -18,6 +20,7 @@ dotnet add package FlowNet.Core
 
 ```csharp
 using FlowNet.Core;
+using System.Threading.Tasks;
 
 namespace YourApp.Namespace;
 
@@ -39,4 +42,48 @@ public sealed partial class Program
 
 然后就可以开始写业务逻辑了——就这么简单，简单到连 template 都不用。
 
-*WORKING IN PROGRESS*
+## 基于流程的开发
+
+将 Program 类改成这样：
+
+```csharp
+using FlowNet.Core;
+using System.Threading.Tasks;
+
+namespace YourApp.Namespace;
+
+[Flow.Scope("app")]
+internal static partial class Program
+{
+    // Run application based on flow control
+    public static Task Main() => FlowInterops.Run();
+
+    // Define base flows
+    [Flow.Task]
+    [Flow.Task("loading")]
+    [Flow.Task("exit")]
+    private static Task Wildcard() => Task.CompletedTask;
+}
+```
+
+然后使用 `Flow.Run` 标记来定义各流程间的依赖关系，例如：
+
+```csharp
+using FlowNet.Core;
+using System.Threading.Tasks;
+
+namespace YourApp.Namespace;
+
+[Flow.Scope("config")]
+public sealed partial class ConfigService
+{
+    [Flow.Task]
+    [Flow.Run(After = "app:loading", Before = "*:start")]
+    private static async Task _()
+    {
+        // 这是一个特殊的 Flow 任务，按照一般的标识符推断规则，它的标识符是空的
+        // 因此这个任务的全局标识就是外部 scope 的标识，即 config
+        // Initialize config service...
+    }
+}
+```