Moved logging stuff over from other project.

Also updated .gitignore.

.gitignore

@@ -1,4 +1,17 @@
-# ---> VisualStudioCode
+
+# Created by https://www.toptal.com/developers/gitignore/api/vscode,dotnetcore
+# Edit at https://www.toptal.com/developers/gitignore?templates=vscode,dotnetcore
+
+### DotnetCore ###
+# .NET Core build folders
+bin/
+obj/
+
+# Common node modules locations
+/node_modules
+/wwwroot/node_modules
+
+### vscode ###
 .vscode/*
 !.vscode/settings.json
 !.vscode/tasks.json
@@ -6,6 +19,4 @@
 !.vscode/extensions.json
 *.code-workspace
 
-# Local History for Visual Studio Code
-.history/
-
+# End of https://www.toptal.com/developers/gitignore/api/vscode,dotnetcore

ILogRecievable.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace SimpleLogger
+{
+    public interface ILogReceiver
+    {
+        string Identifier { get; }
+
+        /// <summary>
+        /// The severity of the messages this log should receive.
+        /// </summary>
+        /// <value>The severity of the logs.</value>
+        LogLevel Level { get; }
+
+        /// <summary>
+        /// Logs the message.
+        /// </summary>
+        /// <param name="message">The message to be logged.</param>
+        /// <param name="time">The time at which this message was requested to be logged.</param>
+        /// <param name="level">The severity of this message.</param>
+        void LogMessage(string message, DateTime time, LogLevel level);
+
+        /// <summary>
+        /// Called when this receiver should explicitly flush received messages.
+        /// </summary>
+        void Flush();
+    }
+}

LogLevel.cs

@@ -0,0 +1,10 @@
+namespace SimpleLogger
+{
+    public enum LogLevel : int
+    {
+        FATAL,
+        INFO,
+        WARNING,
+        DEBUG,
+    }
+}

Logger.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+
+namespace SimpleLogger
+{
+    public static class Logger {
+        private static readonly ConcurrentDictionary<string, ILogReceiver> listeners = new ConcurrentDictionary<string, ILogReceiver>();
+
+        /// <summary>
+        /// Logs the message to listeners that are listening to the set severity of the message or greater.
+        /// </summary>
+        /// <param name="message">The message to log.</param>
+        /// <param name="level">The level of severity, by default, info.</param>
+        public static void Log(string message, LogLevel level = LogLevel.INFO) {
+            foreach (ILogReceiver listener in listeners.Values)
+            {
+                if (level <= listener.Level) {
+                    listener.LogMessage(message, DateTime.Now, level);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Adds a log listener.
+        /// </summary>
+        /// <param name="listener">The listener to add.</param>
+        public static void AddLogListener(ILogReceiver listener) {
+            listeners[listener.Identifier] = listener;
+        }
+
+        /// <summary>
+        /// Removes a log listener.
+        /// </summary>
+        /// <param name="listener">The listener to remove.</param>
+        public static void RemoveLogListener(ILogReceiver listener) {
+            ILogReceiver receiver;
+            listeners.TryRemove(listener.Identifier, out receiver);
+        }
+
+        /// <summary>
+        /// Called when all listeners should perform any flushing they need.
+        /// </summary>
+        public static void FlushListeners()
+        {
+            foreach (ILogReceiver listener in listeners.Values)
+            {
+                listener.Flush();
+            }
+        }
+    }
+}

SimpleLogger.csproj

@@ -0,0 +1,7 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>