first and compiling freertos

docs/freertos/rp2040-freertos-overview.md

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+# RP2040 FreeRTOS Implementation Overview
+
+## Project Structure
+The RP2040-FreeRTOS project provides a modular framework for developing FreeRTOS applications on the RP2040 microcontroller.
+
+### Key Components
+- **FreeRTOS Kernel**: Included as git submodule
+- **Pico SDK**: Raspberry Pi Pico SDK as submodule
+- **Application Templates**: Multiple example applications
+- **Build System**: CMake-based configuration
+
+## Example Applications
+
+### 1. Template App
+- Basic LED flip-flop demonstration
+- Inter-task queue communication
+- Foundation for custom projects
+
+### 2. Scheduling App
+- Temperature sensor integration
+- LED display output
+- Task scheduling demonstration
+
+### 3. IRQs App
+- Interrupt-driven temperature sensing
+- Real-time response capabilities
+
+### 4. Timers App
+- FreeRTOS software timer implementation
+- Periodic task execution
+
+## Build System
+- **Build Tool**: CMake
+- **Configurations**: Debug and Release
+- **Deployment**: Automated deploy script
+- **Languages**: C and C++ support
+
+## Configuration
+- Central configuration: `FreeRTOSConfig.h`
+- Application-specific CMakeLists.txt
+- Flexible and extensible design
+
+## Getting Started
+1. Clone repository with submodules
+2. Configure CMake build
+3. Build selected application
+4. Deploy to RP2040 device
+
+## Development Environment Support
+- Visual Studio Code
+- Xcode
+- Command-line tools