add xunit (#132)

* add xunit

* add logo

* Update modules/xunit/index.md

Co-authored-by: Manuel de la Peña <[email protected]>

---------

Co-authored-by: Manuel de la Peña <[email protected]>

Author: digital88

modules/xunit/index.md

@@ -0,0 +1,29 @@
+---
+title: Xunit
+categories:
+  - test-framework
+docs:
+  - id: dotnet
+    url: https://www.nuget.org/packages/Testcontainers.Xunit
+    maintainer: core
+    example: |
+      ```csharp
+      public sealed partial class RedisContainerTest(ITestOutputHelper testOutputHelper)
+          : ContainerTest<RedisBuilder, RedisContainer>(testOutputHelper)
+      {
+          protected override RedisBuilder Configure(RedisBuilder builder)
+          {
+              // 👇 Configure your container instance here.
+              return builder.WithImage("redis:7.0");
+          }
+      }
+      ```
+    installation: |
+      ```bash
+      dotnet add package Testcontainers.Xunit
+      ```
+description: |
+  The Testcontainers.Xunit package simplifies writing tests with containers in xUnit.net. By leveraging xUnit.net's shared context, this package automates the setup and teardown of test resources, creating and disposing of containers as needed. This reduces repetitive code and avoids common patterns that developers would otherwise need to implement repeatedly.
+
+  You can read full example and docs here: https://dotnet.testcontainers.org/test_frameworks/xunit_net/
+---