Create README.md

MP2/README.md

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+# MP2 Distributed Group Membership
+
+## Files
+- `peer.py` - membership daemon
+- `scripts/cmd.sh` - start/kill/control VMs
+- `scripts/view.sh` - tmux membership dashboard
+- `scripts/pretty_membership.py` - dashboard formatter
+
+## Running a node
+Set `MACHINE_INDEX` to the VM's index, then run:
+
+```bash
+MACHINE_INDEX=1 python3 peer.py
+```
+
+## Starting the demo
+Start the dashboard. `tmux` is required:
+
+```bash
+./scripts/view.sh
+```
+
+From another terminal, start the VMs:
+
+```bash
+./scripts/cmd.sh start 1
+./scripts/cmd.sh start 2 3 4 5
+./scripts/cmd.sh start 6 7 8 9 10
+```
+
+## Commands
+The following commands are available in the peer prompt:
+
+```text
+list_mem
+list_self
+leave
+display_suspects
+switch suspect
+switch nosuspect
+display_protocol
+set_drop_rate <percent>
+```
+
+## Demo/testing helpers
+Run these from the `MP2` directory:
+
+```bash
+./scripts/cmd.sh kill 4 8
+./scripts/cmd.sh start 4 8
+./scripts/cmd.sh cmd all "switch suspect"
+./scripts/cmd.sh cmd all "set_drop_rate 10"
+./scripts/cmd.sh status
+./scripts/cmd.sh log
+```
+
+## Introducer
+`VM1` / `172.22.156.3`
+
+## Notes
+- Gossip is default mode.
+- Artificial drops are applied at receivers.
+- Rejoining processes receive a new timestamp in their node ID.