restructure for ease of use from command line

repo-backup-util/lib/Entrypoint.cs

@@ -0,0 +1,38 @@
+using System.Collections;
+using System.Diagnostics;
+using GitAnchor.Actions;
+
+namespace GitAnchor.Lib;
+
+public class EntryPoint
+{
+    public static async Task<ActivityStatusCode> Run()
+    {
+        string[] args = Environment.GetCommandLineArgs();
+
+        SortedDictionary<string, Task<ActivityStatusCode>> options = new()
+        {
+            { "create", Create.Run() },
+            { "pull", Pull.Run() },
+            { "help", Help.Run() }
+        };
+
+        try
+        {
+            foreach (string arg in args)
+            {
+                var result = options.TryGetValue(arg, out Task<ActivityStatusCode>? action);
+
+                if (!result) continue;
+                if (action != null) return await action;
+            }
+
+            return await Help.Run();
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine(ex.Message);
+            return ActivityStatusCode.Error;
+        }
+    }
+}