Initialize README with project details and instructions

Added project overview, features, connection details, software setup, usage instructions, and library information.

Author: FrozenAssassine

README.md

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+# Daly BMS UART API
+
+This project turns an ESP32 into a small local network API and web interface for Daly BMS devices.
+The ESP32 communicates with the BMS via UART and exposes battery data over HTTP in JSON format.
+
+It is ideal for dashboards, home automation, monitoring tools, or custom battery projects.
+
+## Features
+- UART communication with Daly BMS
+- REST-style JSON API (/data)
+- Built-in web interface served by the ESP32
+- Automatic data refresh every 20 seconds
+- Runs entirely in the local network
+- CORS enabled for easy external access
+
+## Connection
+|Daly BMS|ESP32|
+|----|----|
+|TX|GPIO 16 (RX)|
+|RX|GPIO 17 (TX)|
+|GND| GND|
+
+## Software Setup
+1. Clone the repository
+2. Rename `secrets.example.h` to `secrets.h`
+3. Fill in your WiFi credentials inside secrets.h
+4. Upload to the esp32
+
+## Usage
+After uploading your code, watch the serial console (at 9600 baud rate) for the ip address of your esp32.
+Open the ip address inside your browser and you will see a simple website with information of your bms.
+For the API, you can simple request the `/data` route on your esp32 ip address.
+
+## Used Library
+
+This project uses the daly-bms-uart library:
+https://github.com/maland16/daly-bms-uart
+All BMS communication is handled through this library.