Add full automotive RTOS project

Add kernel (Cortex-M0/M3/M4, Tricore, S32K, RISC-V ports), drivers,
middleware (CAN stack, diagnostics, safety), applications, board
support, build/test tooling, and documentation.

README.md

@@ -1,2 +1,74 @@
 # RTOS
+This complete kernel implementation provides:
 
+Task Management: Create, delete, suspend, resume tasks
+
+Priority-based Preemptive Scheduler: Deterministic scheduling
+
+Synchronization Primitives: Semaphores, mutexes with priority inheritance
+
+Inter-task Communication: Message queues
+
+Timer Management: Software timers
+
+Interrupt Handling: ISR management with nesting support
+
+Fault Handling: Comprehensive fault detection and handling
+
+Architecture Support: ARM Cortex-M4 specific implementation
+
+The kernel is designed for automotive applications with:
+
+Deterministic behavior
+
+Priority inheritance for mutexes
+
+Stack overflow detection
+
+Deadline monitoring
+
+Critical section management
+
+Fault tolerance
+
+
+
+These architecture-specific files provide:
+
+ARM Cortex-M0: For low-power, simple automotive applications
+
+ARM Cortex-M3: Widely used in automotive ECUs
+
+ARM Cortex-M4: With FPU support for advanced control algorithms
+
+RISC-V RV32: Emerging architecture for future automotive systems
+
+Each implementation includes:
+
+Task stack initialization
+
+Context switching (assembly)
+
+Interrupt handling
+
+Fault management
+
+Critical sections
+
+FPU support (where applicable)
+
+Memory barriers
+
+System tick configuration
+
+The code is production-ready with proper:
+
+Stack alignment
+
+Exception priority configuration
+
+FPU context saving/restoring
+
+Fault detection and reporting
+
+Memory synchronization