Add filebased csharp app example to docs (#2519)

Author: licon4812

docs/docs/examples/filebased-csharp.md

@@ -0,0 +1,61 @@
+# File based C# application
+
+Starting with dotnet 10 (preview 4), you can use the new file-based C# application feature to run tests in a more straightforward way.
+
+## Using File-Based C# Application with TUnit
+
+To use TUnit with a file-based C# application, you can follow these steps:
+
+1.  **Create a new C# file**: Create a new file with a `.cs` extension, for example, `Program.cs`.
+2.  **Add TUnit to your project**: You can add TUnit as a package reference in your file. At the top of your `Program.cs`, add the following line:
+
+    ```csharp
+    #:package TUnit@0.*
+    ```
+
+    Alternatively, you can specify a specific version:
+
+    ```csharp
+    #:package TUnit@0.25.0
+    ```
+
+3.  **Write your tests**: You can write your tests in the same way you would in a regular C# project. For example:
+
+        ```csharp
+        #:package TUnit@0.*
+
+        using TUnit;
+        public class Tests
+        {
+            [Test]
+            public void Basic()
+            {
+                Console.WriteLine("This is a basic test");
+            }
+
+            [Test]
+            [Arguments(1, 2, 3)]
+            [Arguments(2, 3, 5)]
+            public async Task DataDrivenArguments(int a, int b, int c)
+            {
+                Console.WriteLine("This one can accept arguments from an attribute");
+                var result = a + b;
+                await Assert.That(result).IsEqualTo(c);
+            }
+
+        }
+
+        ```
+
+    4 **Run your tests**: You can run your tests by executing the script in F# Interactive. The results will be printed to the console.
+    To run the script, you can use the following command
+
+    ```powershell
+    dotnet run Program.cs
+    ```
+
+If you need to convert the file based application to a regular C# project, you can run the following command:
+
+    ```powershell
+    dotnet project convert Program.cs
+    ```

docs/sidebars.ts

@@ -129,6 +129,7 @@ const sidebars: SidebarsConfig = {
         'examples/instrumenting-global-test-ids',
         'examples/tunit-ci-pipeline',
         'examples/fsharp-interactive',
+        'examples/filebased-csharp'
       ],
     },
     {