feat: Implement ESP32-C6 UART driver with basic send/receive functionality and unit tests

Readme.md

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+# Ballu AC ESP32-C6 Controller
+
+Implementation of ESP32-C6 based AC controller that bridges Zigbee controller) communication with UART-based MideaUART protocol for Ballu air conditioner control.
+
+## Overview
+
+This project implements a bridge between Zigbee (Home Assistant) and UART-based MideaUART protocol for controlling Ballu air conditioners using an ESP32-C6 microcontroller.
+
+## Features
+
+- UART communication at 9600 baud 8N1 for MideaUART protocol
+- Zigbee ZCL Thermostat cluster implementation
+- Bidirectional communication between Zigbee and UART layers
+- Status monitoring and error handling
+- Configurable timing controls (50ms command spacing)
+
+## Directory Structure
+
+```
+src/
+  uart_driver.c/h      - UART driver implementation
+  midea_protocol.c/h   - MideaUART protocol encoding/decoding
+  zigbee_zcl.c/h       - Zigbee ZCL Thermostat cluster
+  integration_layer.c/h- Integration between Zigbee and UART layers
+  main.c               - Application entry point
+
+test/
+  uart_driver_test.c          - Unit tests for UART driver
+  midea_protocol_test.c       - Unit tests for MideaUART protocol
+  zigbee_zcl_test.c           - Unit tests for Zigbee ZCL
+  integration_layer_test.c    - Unit tests for integration layer
+
+docs/
+  protocol.md                 - MideaUART protocol details
+  zcl_hvac.md                 - Zigbee ZCL Thermostat cluster details
+  Hardware integration guide.md - Hardware connection information
+  Build system details.md     - Build system and dependencies
+
+## Getting Started
+
+### Prerequisites
+
+- ESP-IDF toolchain
+- ESP32-C6 development board
+- UART to TTL converter (for debugging)
+
+### Building
+
+```bash
+make build
+```
+
+### Uploading
+
+```bash
+make upload
+```
+
+### Running Tests
+
+```bash
+make test
+```
+
+## Implementation Progress
+
+See `docs/plans/2026-07-05-ballu-ac-esp32c6-controller-implementation.md` for detailed implementation plan and progress tracking.
+
+## License
+
+This project is licensed under the MIT License.