Add initial implementation of FTP server with configuration, session handling, and basic commands support

ftp_root/data.json

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+{
+  "project": "FTP Server Implementation",
+  "course": "Computer Networks Design",
+  "language": "Python",
+  "features": [
+    "Multi-threaded server",
+    "User authentication",
+    "File transfer (RETR/GET)",
+    "Directory listing (LIST/DIR)",
+    "Passive mode support",
+    "Error handling"
+  ],
+  "supported_commands": [
+    "USER",
+    "PASS",
+    "PWD",
+    "CWD",
+    "LIST",
+    "NLST",
+    "RETR",
+    "PASV",
+    "PORT",
+    "TYPE",
+    "SYST",
+    "QUIT"
+  ],
+  "test_users": {
+    "admin": "admin123",
+    "user": "password",
+    "test": "test123",
+    "guest": "guest"
+  }
+}

ftp_root/documents/test_doc.txt

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+FTP Server Test Document
+
+This document is located in the documents subdirectory.
+You can navigate to this directory using the CWD command:
+
+CWD documents
+
+Then list the files using:
+LIST
+
+And download this file using:
+RETR test_doc.txt
+
+This tests the directory navigation functionality of the FTP server.

ftp_root/readme.txt

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+Welcome to the FTP Server!
+
+This is the root directory of the FTP server.
+You can download files from here using the GET command.
+
+Available commands:
+- USER <username> : Login with username
+- PASS <password> : Provide password
+- PWD : Show current directory
+- CWD <path> : Change directory
+- LIST : List files in current directory
+- RETR <filename> : Download a file (GET command)
+- QUIT : Disconnect from server
+
+Test users:
+- admin / admin123
+- user / password
+- test / test123
+- guest / guest
+
+Enjoy testing the FTP server!

ftp_root/sample.txt

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+This is a sample text file for testing FTP downloads.
+
+File contents:
+- Line 1: Hello World
+- Line 2: FTP Server Test
+- Line 3: Computer Networks Design Project
+- Line 4: Python Implementation
+
+You can download this file using the RETR command.