Cleans up static loggers

Adds test projects for different frameworks and architectures
Adds registration tool assembly

src/samples/Lithnet.CredentialProvider.Sample.net472.x64/InternalLogger.cs

@@ -0,0 +1,36 @@
+using Microsoft.Extensions.Logging;
+using NLog;
+using NLog.Extensions.Logging;
+
+namespace Lithnet.CredentialProvider.Samples
+{
+    internal static class InternalLogger
+    {
+        internal static ILoggerFactory LoggerFactory { get; }
+
+        static InternalLogger()
+        {
+            /*
+                This sample uses NLog to capture trace events from the provider, but you can use any
+                logging system compatible with Microsoft.Extensions.Logging;
+            */
+
+            var config = new NLog.Config.LoggingConfiguration();
+            var logconsole = new NLog.Targets.ConsoleTarget("logconsole");
+
+            /*
+
+                Add file based logging if required
+
+            */
+
+            var logfile = new NLog.Targets.FileTarget("logfile") { FileName = "c:\\file.txt" };
+            config.AddRule(NLog.LogLevel.Trace, NLog.LogLevel.Fatal, logfile);
+
+            config.AddRule(NLog.LogLevel.Trace, NLog.LogLevel.Fatal, logconsole);
+
+            LogManager.Configuration = config;
+            InternalLogger.LoggerFactory = new NLogLoggerFactory(new NLogLoggerProvider(new NLogProviderOptions() { ReplaceLoggerFactory = true }, LogManager.LogFactory));
+        }
+    }
+}