docs: add Windows PATH setup for nvcc/cmake/gh

Author: Olajide-Badejo

README.md

@@ -66,6 +66,45 @@ gh --version
 
 If any command is not recognized, add the corresponding `bin` directory to your `PATH` and restart your terminal.
 
+### Windows PATH Setup (PowerShell)
+
+Typical install paths:
+
+```powershell
+# CUDA (adjust vX.Y to your installed version, e.g. v12.6)
+C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\vX.Y\bin
+
+# CMake
+C:\Program Files\CMake\bin
+
+# GitHub CLI
+C:\Program Files\GitHub CLI
+```
+
+Temporary for current terminal session:
+
+```powershell
+$env:Path += ";C:\Program Files\CMake\bin;C:\Program Files\GitHub CLI;C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.6\bin"
+```
+
+Persist for your user account:
+
+```powershell
+[Environment]::SetEnvironmentVariable(
+  "Path",
+  $env:Path + ";C:\Program Files\CMake\bin;C:\Program Files\GitHub CLI;C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.6\bin",
+  "User"
+)
+```
+
+Then open a new terminal and verify:
+
+```powershell
+nvcc --version
+cmake --version
+gh --version
+```
+
 ---
 
 ## Build and Run