Add amdgpu installation instruction doc (#13075)

Co-authored-by: Daniel McIlvaney <damcilva@microsoft.com>

Author: gjswalling

toolkit/docs/amd/amd.md

@@ -0,0 +1,19 @@
+# AMD Repository Configuration
+
+## Overview
+The following documentation describes how to access Azure Linux packages from the AMD RPM repository at [packages.microsoft.com](https://packages.microsoft.com/azurelinux/3.0/prod/amd/)
+
+## Instructions
+The following instructions register the amd package store with the package manager and install the amdgpu package.
+```ls
+sudo tdnf install -y azurelinux-repos-amd
+sudo tdnf install -y amdgpu
+```
+
+## Notes
+1. Packages earlier than March 2025 (amdgpu-6.10.5.60302_2109964-1_6.6.78.1.3.azl3.x86_64.rpm) require an additional step `sudo modprobe amdgpu` or reboot to load the kernel modules.
+1. Installing for an older kernel may require a specific driver version, for example:
+  - `uname -a` reports `6.6.64.2-9.azl3` is running
+  - `tdnf list amdgpu` lists the available driver versions
+  - amdgpu-6.8.5.60202_2078359-6_6.6.64.2.9.azl3.x86_64.rpm is the package for this kernel
+  - `sudo tdnf install amdgpu-6.8.5.60202_2078359` installs it