feat: Add install script for windows.

Author: hamflx

install.ps1

@@ -0,0 +1,23 @@
+$repo = "hamflx/fetchbrowser"
+$file = "fb.exe"
+
+$releases = "https://api.github.com/repos/$repo/releases"
+
+Write-Host Determining latest release
+$tag = (Invoke-WebRequest $releases | ConvertFrom-Json)[0].tag_name
+
+$download = "https://github.com/$repo/releases/download/$tag/$file"
+$fb_dir = "$HOME/.fb"
+$fb_bin_dir = "$fb_dir/bin"
+$fb_bin_path = "$fb_bin_dir/$file"
+
+New-Item "$fb_bin_dir" -ItemType Directory -Force
+
+Write-Host Dowloading latest release
+Invoke-WebRequest $download -Out $fb_bin_path
+
+$old_path = [System.Environment]::GetEnvironmentVariable("PATH", "User")
+if ($old_path -notcontains $fb_bin_path) {
+  $new_path = $old_path + [IO.Path]::PathSeparator + $fb_bin_path
+  [Environment]::SetEnvironmentVariable("PATH", $new_path, "User")
+}