updated readme for more comprehensive build instructions

README.md

@@ -1,9 +1,21 @@
 # FoundryOS
 
-## Cloning and building
+## Build dependencies
 
-Here are some simple steps to get started:
+* latest rust nightly release
+* all necessary rust components installed
+* xorriso: creates ISO images to be booted from.
+* (Optional / Recommended) Qemu: to run the kernel. (this may be packaged as qemu-desktop)
+* (Optional) GDB: for debugging the kernel.
 
+```sh
+rustup update
+rustup override set nightly
+rustup component add rust-src
+rustup component add llvm-tools-preview
+```
+
+## Building & Running in Qemu:
 ```sh
 git clone https://git.zxq5.dev/OsDev/FoundryOS.git
 cargo run
@@ -13,12 +25,3 @@ cargo run
 ```sh
 USE_GDB=1 cargo run
 ```
-
-### Build dependencies
-
-* libisoburn: creates ISO images to be booted from.
-* qemu: to run the kernel.
-
-Optionally,
-
-* GDB: for debugging the kernel.