Add command line interface and change solution structure (#26)

DiscordChatExporter.Core/Internal/AssemblyHelper.cs

@@ -0,0 +1,23 @@
+using System.IO;
+using System.Reflection;
+using System.Resources;
+
+namespace DiscordChatExporter.Core.Internal
+{
+    internal static class AssemblyHelper
+    {
+        public static string GetResourceString(string resourcePath)
+        {
+            var assembly = Assembly.GetExecutingAssembly();
+            var stream = assembly.GetManifestResourceStream(resourcePath);
+            if (stream == null)
+                throw new MissingManifestResourceException($"Could not find resource [{resourcePath}].");
+
+            using (stream)
+            using (var reader = new StreamReader(stream))
+            {
+                return reader.ReadToEnd();
+            }
+        }
+    }
+}