Mention build instructions

Author: jserv

README.md

@@ -6,6 +6,25 @@ Operating System (RTOS). The primary target platform for this project is the Arm
 Cortex-R5 processor, showcasing the integration of Rust with ThreadX for
 high-performance real-time applications.
 
+## Build and Run
+
+Visit the [Arm GNU Toolchain](https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads)
+page and choose the AArch32 bare-metal target (`arm-none-eabi`) toolchain
+variant compatible with your development environment.
+
+Install Rust via `rustup` (Recommended)
+```shell
+$ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+```
+
+Then, enable bare-metal target for CPUs in the Armv7-R architecture family.
+```shell
+$ rustup target add armv7r-none-eabihf
+```
+
+Run `make` to build both ThreadX and Rust code from source.
+Run `make run` to launch Rust-written tasks on ThreadX via QEMU.
+
 ## Licence
 
 This project is available under a permissive MIT-style license.