Initial commit: ESP32-S3 UWB positioning system

- Added anchor and tag implementations for MaUWB modules
- Configured for 6.8Mbps communication with range filtering
- Support for multiple tags (tag/tag2 environments)
- OLED display integration for real-time measurements
- Simplified code without sleep mode and OTA functionality
- Complete UWBHelper library for AT command interface

README.md

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+# MaUWB ESP32-S3 Positioning System
+
+Ultra-wideband (UWB) positioning system using ESP32-S3 and Makerfabs UWB modules.
+
+## Features
+- ESP32-S3 based anchor and tag devices
+- Real-time distance measurement with <10cm accuracy
+- OLED display for status and measurements
+- Multiple tag support (up to 64 tags)
+- 6.8Mbps communication rate
+- Serial debugging output
+
+## Hardware
+- ESP32-S3 DevKit
+- Makerfabs UWB AT Module
+- SSD1306 OLED Display (128x64)
+
+## Environments
+- `anchor`: Base station for positioning
+- `tag`: Mobile device for tracking (ID 1)
+- `tag2`: Mobile device for tracking (ID 2)
+
+## Build & Upload
+```bash
+# Build specific environment
+pio run -e anchor
+pio run -e tag
+
+# Upload to device
+pio run -e tag -t upload
+
+# Monitor serial output
+pio device monitor
+```
+
+## Configuration
+- Network ID: 1234
+- Baud Rate: 115200
+- Communication: 6.8Mbps
+- Range filtering: Enabled