Added README.md for minimal docs

README.md

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+# Serial Sync
+Serial Sync is a python library that handles clock synchronization between an external device (ie Arduino) and a computer, the object handles calibration which determines the clock offset and clock drift to correct over time.
+
+> [!NOTE]
+> Serial especially over USB has inherent jitter which cannot be easily corrected for, this library is a best effort synchronization method but should not be trusted for sub millisecond sync.
+
+## Installation
+To install the library with uv:
+```bash
+uv add git+https://git.h3cx.dev/Exergie/serial-sync.git --tag v0.1.1
+```
+
+## Usage
+Here is a simple usage example, the `SerialSync` object takes a `Serial` object as an input. Here the synchronization is done over a 30 second period
+```python
+with Serial(
+    port="/dev/ttyUSB0",
+    baudrate=115200,
+    timeout=1,
+) as serial:
+
+    sync = SerialSync(serial)
+
+    sync.calibrate_sync(30)
+
+```
+
+Once the sync is complete, you can use the `convert_timestamp(timestamp_ns: int)` API to convert an incoming timestamp from the external device into a timestamp on the same time-base as python's `time.monotonic_ns()`