Add NUnit test project

test/WireMock.Net.NUnitTests/UnitTest1.cs

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+using WireMock.Server;
+
+namespace WireMock.Net.NUnitTests;
+
+[TestFixture]
+public class Test
+{
+    private WireMockServer server;
+
+    [SetUp]
+    public void Setup()
+    {
+        server = WireMockServer.Start();
+    }
+
+    [Test]
+    public void SomeTest()
+    {
+        Assert.Pass();
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        server.Stop();
+    }
+}

test/WireMock.Net.NUnitTests/Usings.cs

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+global using NUnit.Framework;

test/WireMock.Net.NUnitTests/WireMock.Net.NUnitTests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.3.0" />
+    <PackageReference Include="coverlet.collector" Version="3.1.2" />
+    <PackageReference Include="WireMock.Net" Version="1.5.13" />
+  </ItemGroup>
+
+</Project>