Create WireMock.Net.MimePart project (#1300)

* Create WireMock.Net.MimePart project

* .

* REFACTOR

* ILRepack

* --

* ...

* x

* x

* .

* fix

* public class MimePartMatcher

* shared

* min

* .

* <!--<DelaySign>true</DelaySign>-->

* Update README.md

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

src/WireMock.Net.Minimal/Extensions/TimeSettingsExtensions.cs

@@ -0,0 +1,36 @@
+// Copyright © WireMock.Net
+
+using System;
+using WireMock.Models;
+
+namespace WireMock.Extensions;
+
+internal static class TimeSettingsExtensions
+{
+    public static bool IsValid(this ITimeSettings? settings)
+    {
+        if (settings == null)
+        {
+            return true;
+        }
+
+        var now = DateTime.Now;
+        var start = settings.Start ?? now;
+        DateTime end;
+
+        if (settings.End != null)
+        {
+            end = settings.End.Value;
+        }
+        else if (settings.TTL != null)
+        {
+            end = start.AddSeconds(settings.TTL.Value);
+        }
+        else
+        {
+            end = DateTime.MaxValue;
+        }
+
+        return now >= start && now <= end;
+    }
+}