Move DevDrive project to repo root

FloppyFileNode.cs

@@ -0,0 +1,39 @@
+using System.Security.AccessControl;
+
+namespace DevDrive;
+
+/// <summary>
+/// Represents a file or directory node in the virtual file system.
+/// </summary>
+public class FloppyFileNode
+{
+    public string Name { get; set; }
+    public string FullPath { get; set; }
+    public bool IsDirectory { get; set; }
+    public FileAttributes Attributes { get; set; }
+    public byte[] Data { get; set; }
+    public DateTime CreationTime { get; set; }
+    public DateTime LastAccessTime { get; set; }
+    public DateTime LastWriteTime { get; set; }
+    public FileSystemSecurity? Security { get; set; }
+    public string? SymlinkTarget { get; set; }
+    public bool IsSymlink => !string.IsNullOrEmpty(SymlinkTarget);
+
+    public FloppyFileNode(string fullPath, bool isDirectory)
+    {
+        FullPath = fullPath.TrimEnd('\\');
+        Name = Path.GetFileName(fullPath);
+        if (string.IsNullOrEmpty(Name))
+        {
+            Name = "\\";
+        }
+        IsDirectory = isDirectory;
+        Attributes = isDirectory ? FileAttributes.Directory : FileAttributes.Normal;
+        Data = [];
+        CreationTime = DateTime.Now;
+        LastAccessTime = DateTime.Now;
+        LastWriteTime = DateTime.Now;
+    }
+
+    public long FileSize => IsDirectory ? 0 : Data.Length;
+}