feat：csharp 2.0 xdb maker

maker/csharp/IP2RegionMaker/Program.cs

@@ -0,0 +1,72 @@
+using IP2RegionMaker.XDB;
+using System.Diagnostics;
+
+
+string srcFile = "", dstFile = "";
+IndexPolicy indexPolicy = IndexPolicy.VectorIndexPolicy;
+
+if (args.Length < 2)
+{
+    PrintHelp();
+}
+
+string[] aliases = { "--src", "--dst", "--index" };
+for (int i = 0; i < args.Length; i++)
+{
+    var arg = args[i];
+
+    var key = aliases.FirstOrDefault(x => arg.StartsWith($"{x}="));
+    if (string.IsNullOrEmpty(key))
+    {
+        continue;
+    }
+
+    var value = arg.Split("=", 2).LastOrDefault()?.Trim();
+
+    if (string.IsNullOrEmpty(value))
+    {
+        continue;
+    }
+
+    switch (key)
+    {
+        case "--src":
+            srcFile = value;
+            break;
+        case "--dst":
+            dstFile = value;
+            break;
+        case "--index":
+            var flag = Enum.TryParse<IndexPolicy>(value, out indexPolicy);
+            Console.WriteLine("parse policy failed {arg}", arg);
+            break;
+    }
+}
+
+Console.WriteLine(srcFile);
+
+if (string.IsNullOrEmpty(srcFile)||string.IsNullOrEmpty(dstFile))
+{
+    PrintHelp();
+    return;
+}
+
+
+Stopwatch stopwatch = new Stopwatch();
+stopwatch.Start();
+
+Maker maker = new Maker(IndexPolicy.VectorIndexPolicy, srcFile, dstFile);
+maker.Init();
+maker.Build();
+
+stopwatch.Stop();
+Console.WriteLine($"Done, elapsed:{stopwatch.Elapsed.TotalMinutes}m");
+
+
+void PrintHelp()
+{
+    Console.WriteLine($"ip2region xdb maker");
+    Console.WriteLine("dotnet IP2RegionMaker.dll [command options]");
+    Console.WriteLine("--src string    source ip text file path");
+    Console.WriteLine("--dst string    destination binary xdb file path");
+}