docs: add ROADMAP.md

Author: karngyan

ROADMAP.md

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+# Roadmap
+
+What's next for clipx. Roughly ordered by priority.
+
+## v0.6 — Encryption
+
+Right now clipboard content flies across your LAN in plaintext. Fine for a home network, sketchy for a shared office.
+
+- [ ] AES-256-GCM encryption of all clipboard payloads
+- [ ] Shared secret generated on first `clipx pair`, exchanged out-of-band (displayed in terminal, user copies it)
+- [ ] Zero config overhead — encryption is always on once paired
+
+## v0.7 — Image support
+
+Currently text only (`pbcopy`/`pbpaste`). macOS has richer clipboard APIs.
+
+- [ ] Detect clipboard content type (text, image, file path)
+- [ ] Image sync using `osascript` or native clipboard APIs via cgo
+- [ ] Respect size limits — images can be large, chunk transfer already handles up to 10 MB
+
+## v0.8 — Smarter pairing
+
+Manual IP entry works but is friction.
+
+- [ ] `clipx pair --scan` — scan the local subnet for other clipx instances
+- [ ] mDNS/Bonjour discovery as an alternative to IP-based pairing
+- [ ] Pairing confirmation — peer shows a prompt to accept/reject
+
+## v0.9 — Linux support
+
+The protocol is platform-agnostic, only the clipboard is macOS-specific.
+
+- [ ] Abstract clipboard behind build tags (`clipboard_darwin.go`, `clipboard_linux.go`)
+- [ ] Linux: `xclip`/`xsel` for X11, `wl-copy`/`wl-paste` for Wayland
+- [ ] CI testing on Linux
+
+## v1.0 — Stable release
+
+- [ ] All of the above shipped and stable
+- [ ] Homebrew core submission (not just a tap)
+- [ ] Man page (`clipx.1`)
+- [ ] Proper semantic versioning contract — no breaking changes after v1
+
+## Maybe later
+
+Things that might be worth doing but aren't committed to.
+
+- **File sync** — drag a file on one Mac, paste on another. Needs a different transport (TCP for reliability).
+- **Clipboard history** — keep the last N items, `clipx history` to browse.
+- **Menu bar app** — native macOS status bar icon showing connection status. Probably a separate repo.
+- **Windows support** — `clip.exe` / PowerShell clipboard. Low priority unless there's demand.
+- **Tailscale/WireGuard awareness** — detect if peers are on a VPN and skip encryption (already encrypted at the tunnel level).