Separate building instructions from the main README file

This is done both for aesthetics and clarity.

A separate building document allows for specifying platform-specific
instructions. It also allows the documnet to be more clear-cut.

BUILDING.md

@@ -0,0 +1,60 @@
+# Building
+
+This document assumes that you are using a GNU/Linux enviroment. If you are running on Windows, WSL or a VM should work.
+
+## Prerequisites
+
+### Fedora
+
+```
+sudo dnf install texinfo binutils-devel curl cmake mpfr-devel libmpc-devel gmp-devel patch @"C Development Tools and Libraries" git
+```
+
+### openSUSE
+
+```
+sudo zypper install curl cmake mpfr-devel mpc-devel gmp-devel patch gcc gcc-c++ patterns-devel-C-C++-devel_C_C++ git
+```
+
+### Void Linux
+
+```
+sudo xbps-install -S base-devel cmake curl mpfr-devel libmpc-devel gmp-devel git
+```
+
+### ALT Linux
+
+```
+apt-get install curl cmake libmpc-devel gmp-devel libmpfr-devel patch git
+```
+
+## Cloning the repository
+
+```
+git clone --depth 1 --recurse-submodules --shallow-submodules https://github.com/xslendix/yros.git
+cd yros
+```
+
+Since this project uses buildroot as a submodule, `--recurse-submodules` is required. The repositories are also shallow cloned so it doesn't take too much time just to get everything downloaded.
+
+## Starting a build
+
+### With GUI:
+```
+make rpi3_64-gui
+# OR
+make rpi4_64-gui
+```
+
+### Without GUI (headless) (not yet available):
+```
+make rpi3_64-nogui
+# OR
+make rpi4_64-nogui
+```
+
+A typical build on my machine takes ~2 hours. Of course, for you it may take longer or less, so be sure to have something to do while you're waiting.
+
+## Flashing the image
+
+The output image file can be found at `buildroot/output/images.img`.

README.md

@@ -4,13 +4,4 @@ This project utilizes [Buildroot](https://buildroot.org/) to create a fast, port
 
 ## Building
 
-```
-make rpi3_64-gui
-# OR
-make rpi4_64-gui
-```
-
-## Known bugs
-
- * rpi4 build includes the rpi3 config.txt file. The file needs to be manually replaced after each flashed.
-
+For build instructions please check out [BUILDING.md](/BUILDING.md).