Add meta files

README, CHANGELOG, and CONTRIBUTING

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security

CONTRIBUTING.md

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+# Contributing
+
+## Changelog
+
+This project uses semantic versioning and KeepAChangelog format. Always update
+CHANGELOG.md.
+
+## API Documentation
+
+### Style
+
+All method documentation is written in the present tense. For example, "Creates a new..."
+rather than "Create a new...".

README.md

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+# RN2903
+## A Rusty interface for the RN2903 serial protocol
+
+The RN2903 is a LoRa and FSK transciever for the 915MHz ISM band, commonly used in USB
+devices like the LoStik.
+
+This crate provides a safe, idiomatic interface using cross-platform native serial
+functionality via `serialport`. This supports, for instance, a LoStik connected to a USB
+TTY or virtual COM port, or a RN2903 connected via a TTL serial interface.
+
+## Example
+
+For instance, here is a simple program which blinks the LoStik's LED using the RN2903's
+GPIO functionality.
+
+```rust
+use rn2903::Rn2903;
+use std::time::Duration;
+use std::thread;
+
+fn main() {
+    let mut txvr = Rn2903::new_at("/dev/ttyUSB0")
+        .expect("Could not open device. Error");
+    loop {
+        txvr.transact(b"radio set pindig GPIO10 0").unwrap();
+        thread::sleep(Duration::from_millis(1000));
+        txvr.transact(b"radio set pindig GPIO10 1").unwrap();
+        thread::sleep(Duration::from_millis(1000));
+    }
+}
+```