Added method monitoring for finding slow methods

Sprung/FodyWeavers.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<Weavers>
+  <MethodTimer/>
+</Weavers>

Sprung/MethodTimerLogger.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Sprung
+{
+    public static class MethodTimeLogger
+    {
+        public static void Log(MethodBase methodBase, long milliseconds, string message)
+        {
+            using (StreamWriter w = File.AppendText("log.txt"))
+            {
+                w.WriteLine($"{methodBase.Name} {milliseconds}");
+            }
+        }
+    }
+}