Created FluentAssertions (markdown)

FluentAssertions.md

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+#FluentAssertions
+With the NuGet Package [WireMock.Net.FluentAssertions](https://www.nuget.org/packages/WireMock.Net.FluentAssertions), it's possible to verify if certain calls are made.
+
+
+``` c#
+[Fact]
+public async Task AtUrl_WhenACallWasMadeToUrl_Should_BeOK()
+{
+  await _httpClient.GetAsync("anyurl").ConfigureAwait(false);
+
+  _server.Should()
+    .HaveReceivedACall()
+    .AtUrl($"http://localhost:{_portUsed}/anyurl");
+}
+```