add CHANGELOG.md

Author: calebbourg

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).
+
+## [0.3.0] - 2022-01-12
+
+Project related:
+* First fully public release published to crates.io
+
+Features list:
+* Monitor WiFi network connection status (revisit)
+* Send a valid TCP data stream to remote server (no receiving/parsing a response)
+* Support the use of both IP addresses and host names for remote servers
+
+Enhancements list:
+* Address all current outstanding security audit issues: https://github.com/Jim-Hodapp-Coaching/esp32-wroom-rp/security/code-scanning
+
+
+## [0.2.0] - 2022-10-27
+
+New Features:
+* Join a provided WiFi network (non-enterprise)
+* Leave a WiFi network
+
+Enhancements:
+* Runnable test harness for unit and doctests
+* Improve architecture for Nina protocol implementation functions
+* Eliminate all current rustc compiler warnings
+* Improve on error handling throughout existing code
+
+## [0.1.0] - 2022-08-19
+
+After a long and fun road through a [proof-of-concept](https://github.com/Jim-Hodapp-Coaching/esp32-pico-wifi) through to this simple but significant milestone, we are happy to announce a first unstable release of our embedded Rust crate `esp32-wroom-rp`. This provides the groundwork for significant WiFI functionality for the first generation RP2040 series feather boards provided by several different vendors.
+
+Besides putting significant aspects of the software design and architecture in place, this release includes the following features:
+
+### Feature list:
+
+- Retrieves the current version of the NINA firmware on the ESP32 target
+- Provides an example embedded program demonstrating retrieving the NINA firmware version