Add BIOS and tiny kernel roadmap phases

Tutorial/README.md

@@ -27,13 +27,15 @@ is to explain what to learn, what to verify, and what mistakes to avoid.
 - [Phase 6 - Load/Store](phase-06-load-store/phase-06.md)
 - [Phase 7 - Memory-Mapped UART](phase-07-uart-mmio/phase-07.md)
 - [Phase 8 - GCC Toolchain Integration](phase-08-gcc-toolchain/phase-08.md)
-- [Phase 9 - CSRs + M-Mode Traps](phase-09-csrs-traps/phase-09.md)
-- [Phase 10 - Timer](phase-10-timer/phase-10.md)
-- [Phase 11 - Interrupt Controller](phase-11-interrupt-controller/phase-11.md)
-- [Phase 12 - Atomics](phase-12-atomics/phase-12.md)
-- [Phase 13 - Pipeline](phase-13-pipeline/phase-13.md)
-- [Phase 14 - SPI Flash + DRAM](phase-14-flash-dram/phase-14.md)
-- [Phase 15 - M/S/U + Sv32](phase-15-privilege-sv32/phase-15.md)
-- [Phase 16 - Linux Boot Contract](phase-16-linux-boot-contract/phase-16.md)
-- [Phase 17 - Linux](phase-17-linux/phase-17.md)
-
+- [Phase 9 - GCC-Built BIOS / Serial Monitor](phase-09-bios-monitor/phase-09.md)
+- [Phase 10 - Minimal ELF Loader](phase-10-elf-loader/phase-10.md)
+- [Phase 11 - Tiny Kernel + Command Shell](phase-11-tiny-kernel/phase-11.md)
+- [Phase 12 - CSRs + M-Mode Traps](phase-12-csrs-traps/phase-12.md)
+- [Phase 13 - Timer](phase-13-timer/phase-13.md)
+- [Phase 14 - Interrupt Controller](phase-14-interrupt-controller/phase-14.md)
+- [Phase 15 - Atomics](phase-15-atomics/phase-15.md)
+- [Phase 16 - Pipeline](phase-16-pipeline/phase-16.md)
+- [Phase 17 - SPI Flash + DRAM](phase-17-flash-dram/phase-17.md)
+- [Phase 18 - M/S/U + Sv32](phase-18-privilege-sv32/phase-18.md)
+- [Phase 19 - Linux Boot Contract](phase-19-linux-boot-contract/phase-19.md)
+- [Phase 20 - Linux](phase-20-linux/phase-20.md)