feat: add Termux build/setup scripts and client config example

qpc.toml.example

@@ -0,0 +1,53 @@
+# quicprochat client configuration.
+#
+# Place this file at one of these paths (checked in order):
+#   1. Path given by --config <path>
+#   2. $QPC_CONFIG env var
+#   3. $XDG_CONFIG_HOME/qpc/config.toml  (usually ~/.config/qpc/config.toml)
+#   4. ~/.qpc.toml
+#
+# Precedence: CLI flags > environment variables > this file > defaults.
+# All fields are optional — only set what you want to change.
+
+# ── Connection ────────────────────────────────────────────────────────────────
+
+# Server address (host:port).
+# server = "chat.example.com:7000"
+
+# TLS server name (must match certificate SAN).
+# server_name = "chat.example.com"
+
+# Path to server's TLS certificate (for self-signed setups).
+# ca_cert = "data/server-cert.der"
+
+# Skip TLS certificate verification (development/self-signed only!).
+# danger_accept_invalid_certs = false
+
+# Don't auto-start a local qpc-server process.
+# no_server = true
+
+# ── Authentication ────────────────────────────────────────────────────────────
+
+# OPAQUE username — set this so you don't need to type -u every time.
+# username = "alice"
+
+# OPAQUE password — if omitted, you'll be prompted securely.
+# Storing passwords in config files is discouraged for shared devices.
+# password = "secret"
+
+# ── State ─────────────────────────────────────────────────────────────────────
+
+# Path to client state file (identity keys + MLS state).
+# Tip: use an absolute path on mobile (e.g. /data/data/com.termux/.../qpc-state.bin).
+# state = "qpc-state.bin"
+
+# Password to encrypt the state file at rest (Argon2id + ChaCha20-Poly1305).
+# state_password = ""
+
+# ── Advanced ──────────────────────────────────────────────────────────────────
+
+# Bearer/session token (alternative to OPAQUE login).
+# access_token = ""
+
+# Device identifier (for multi-device setups).
+# device_id = ""