Add setup_venv.ps1 for windows (#448)

Powershell users can run ./setup_venv.ps1 to setup the env

setup_venv.ps1

@@ -0,0 +1,40 @@
+#Write-Host "Installing python"
+
+#Start-Process winget install Python.Python.3.10 '/quiet InstallAllUsers=1 PrependPath=1' -wait -NoNewWindow
+
+#Write-Host "python installation completed successfully"
+
+#Write-Host "Reload environment variables"
+#$env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
+#Write-Host "Reloaded environment variables"
+
+
+# redirect stderr into stdout
+$p = &{python -V} 2>&1
+# check if an ErrorRecord was returned
+$version = if($p -is [System.Management.Automation.ErrorRecord])
+{
+    # grab the version string from the error message
+    $p.Exception.Message
+}
+else
+{
+    # otherwise return as is
+    $p
+}
+
+Write-Host "Python version found is"
+Write-Host $p
+
+
+Write-Host "Installing Build Dependencies"
+python -m venv .\shark.venv\
+.\shark.venv\Scripts\activate
+pip install -r requirements.txt
+pip install --pre torch-mlir torch torchvision --extra-index-url https://download.pytorch.org/whl/nightly/cu116 -f https://llvm.github.io/torch-mlir/package-index/
+pip install --upgrade -f https://nod-ai.github.io/SHARK-Runtime/pip-release-links.html iree-compiler iree-runtime
+Write-Host "Building SHARK..."
+pip install -e . -f https://llvm.github.io/torch-mlir/package-index/ -f https://nod-ai.github.io/SHARK-Runtime/pip-release-links.html
+pip install diffusers transformers scipy
+Write-Host "Build and installation completed successfully"
+Write-Host "Source your venv with ./shark.venv/Scripts/activate"