docs: added QUICKSTART.md for reproducible setup and demo for review and audits

Author: abhiprd2000

QUICKSTART.md

@@ -0,0 +1,50 @@
+# Axiom OS — Quick Start Guide
+
+## Prerequisites
+
+```bash
+# Install Rust nightly
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup toolchain install nightly
+rustup override set nightly
+
+# Install bootimage
+cargo install bootimage
+
+# Install QEMU
+sudo apt install qemu-system-x86 qemu-system-arm
+
+# Install ARM64 cross tools (for ARM build only)
+sudo apt install binutils-aarch64-linux-gnu
+```
+
+## Boot x86_64
+
+```bash
+git clone https://github.com/abhiprd2000/axiom-os-kernel.git
+cd axiom-os-kernel
+cargo run --bin axiom_os
+```
+
+Expected output: AXIOM OS v0.2.0-alpha banner with shell prompt.
+
+## Boot ARM64
+
+```bash
+./run_arm.sh
+```
+
+Expected output: AXIOM OS v0.2.0-alpha - aarch64, BLAKE3 hash, benchmark results.
+
+## Run Benchmarks
+
+Inside the x86_64 shell:
+bench
+
+## Demo: Tamper Detection
+trust secret hello world
+cat secret
+tamper secret
+cat secret
+
+Last command shows: READ BLOCKED — provenance violation