Initial commit: README

README.md

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+# Lullalink
+
+Peer-to-peer baby monitor for Flutter.
+
+- **Child device** (one phone, near the baby) streams audio, video, and
+  gyro/accelerometer data to the **parent device** (the other phone, near the
+  parent) over WiFi — no cloud, no server.
+- **Secure by default**: all streams use **mutual TLS (mTLS)** with self-signed
+  certificates. Two phones trust each other by scanning a **QR code** of either
+  device, and a pairing passphrase is required by default.
+- Audio and video streaming are each independently toggleable on the transmit
+  side (child) and the receive side (parent).
+- The parent sees a live audio **gain graph**, a **frequency spectrum** of
+  captured audio, and a **movement graph** derived from the child phone's
+  gyro/accelerometer (phone rests on the bed → baby movement is visible).
+- The parent can configure **notification thresholds** (e.g. sound level,
+  movement frequency).
+- Future (v0.2): optional on-device ML on either device for movement
+  classification and audio/sound-type classification.
+
+## Development
+
+Tests — including all UI/graphical tests (golden/widget tests, fake plugins,
+no physical device) — must run and be verifiable entirely in **headless CI**.