Add project files.

LeagueAPI/Utils/PortTokenWithLockfile.cs

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+using System.Diagnostics;
+using System.Diagnostics.CodeAnalysis;
+
+namespace LeagueAPI.Utils;
+
+internal class PortTokenWithLockfile : IPortTokenBehavior
+{
+    public bool TryGet(Process process, out string remotingAuthToken, out int appPort, [NotNullWhen(false)] out Exception? exception)
+    {
+        try
+        {
+            DirectoryInfo directory = new(Path.GetDirectoryName(process.MainModule?.FileName) ?? throw new FileNotFoundException("Lockfile not found.", "lockfile"));
+            FileInfo lockfile = new(Path.Join(directory.FullName, "lockfile"));
+            while (!lockfile.Exists)
+            {
+                if (directory.Root == directory)
+                {
+                    break;
+                }
+                directory = directory.Parent ?? directory.Root;
+                lockfile = new(Path.Join(directory.FullName, "lockfile"));
+            }
+
+            using FileStream stream = lockfile.Open(FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+            using StreamReader streamReader = new(stream);
+            string[] array = streamReader.ReadToEnd().Split(":");
+            if (array is not [string clientName, string pid, string port, string secret, string protocol] || !int.TryParse(port, out appPort))
+            {
+                throw new Exception("Failed to parse lockfile.");
+            }
+            remotingAuthToken = secret;
+            exception = null;
+            return true;
+        }
+        catch (Exception ex)
+        {
+            remotingAuthToken = string.Empty;
+            appPort = 0;
+            exception = ex;
+            return false;
+        }
+    }
+}