[Enhancement]: replace functionalities and added minimal features

COMMAND.md

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+# Commands for testing
+
+## Commands for testing
+
+### Test 1: Same Machine, Two Terminals
+
+```bash
+# activate the virtual environment
+source .venv/bin/activate
+
+# Terminal 1
+python main.py --port 9000
+
+# Terminal 2
+python main.py --port 9001 --connect 127.0.0.1:9000
+```
+
+### Test 2: Two Machines, Same LAN
+
+```bash
+# Machine A (Ex: 192.168.1.10)
+python3 main.py --port 9000 --mine
+
+# Machine B (Ex: 192.168.1.20)
+python3 main.py --port 9001 --connect 192.168.1.10:9000
+```
+
+**Follow the below steps for test 2**
+
+**find the IP addresses**
+
+```bash
+# run this both on machine A and machine B
+ip addr | grep "inet " | grep -v 127.0.0.1
+# or
+hostname -I
+```
+
+### Machine A (WSL + Windows Port Forwarding)
+
+**WSL: Start the node (miner)**
+
+```bash
+cd /path/to/minichain  # adjust to your project directory
+source .venv/bin/activate
+python3 main.py --port 9000 --mine
+```
+
+**Windows PowerShell (Admin): Forward port 9000 to WSL**
+
+```powershell
+$wslIp = wsl hostname -I
+$wslIp = $wslIp.Trim()
+netsh interface portproxy add v4tov4 listenport=9000 listenaddress=0.0.0.0 connectport=9000 connectaddress=$wslIp
+netsh advfirewall firewall add rule name="MiniChain Node" dir=in action=allow protocol=tcp localport=9000
+netsh interface portproxy show all
+```
+
+### Machine B (Same LAN)
+
+**Test connectivity first**:
+
+```bash
+ping 192.168.137.10
+```
+
+**Test port first:**
+
+```bash
+# linux
+nc -zv 192.168.137.10 9000
+
+# windows
+Test-NetConnection -ComputerName 192.168.137.10 -Port 9000
+```
+
+**If ping works, start the node for (Linux/macOS):**
+
+```bash
+cd minichain
+source .venv/bin/activate
+python3 main.py --port 9001 --connect 192.168.137.10:9000
+```
+
+**Windows:**
+
+```powershell
+cd minichain
+python main.py --port 9001 --connect 192.168.137.10:9000
+```
+
+