Clean up RESET_TO_MAIN_FLOW.md

Convert execution flow to mermaid diagrams

Revise README for improved clarity and structure

Add detailed execution flow from reset to main

Update README.md

Create nvram-manager.md

Update Can_Bus–Bare-metal_Learning_Notes.md

Update Can_Bus–Bare-metal_Learning_Notes.md

Create CAN Bare-Metal Learning Notes

Update README.md

Add guide for debugging UART and I2C in VS Code

Add CLOCK_SYSTEM.md with clock fundamentals and rules

Add notes on Interrupts and NVIC

Create CPU_CORE.md with CPU core details

Document system architecture and memory map