Mention installing Windows VS C++ build tools

Adds a sentence about the C++ build tools being a prerequisite on Windows.

Author: ChrisDenton

locales/en-US/tools.ftl

@@ -154,7 +154,7 @@ install-other-methods-link = Learn more
 ## components/tools/rustup.hbs
 
 tools-rustup-unixy = It looks like you’re running macOS, Linux, or another Unix-like OS. To download Rustup and install Rust, run the following in your terminal, then follow the on-screen instructions. See <a href="https://forge.rust-lang.org/infra/other-installation-methods.html">"Other Installation Methods"</a> if you are on Windows.
-tools-rustup-windows = It looks like you’re running Windows. To start using Rust, download the installer, then run the program and follow the onscreen instructions. See <a href="https://forge.rust-lang.org/infra/other-installation-methods.html">"Other Installation Methods"</a> if you are not on Windows.
+tools-rustup-windows = It looks like you’re running Windows. To start using Rust, download the installer, then run the program and follow the onscreen instructions. You may need to install the <a href="https://visualstudio.microsoft.com/visual-cpp-build-tools/">Visual Studio C++ Build tools</a> when prompted to do so. If you are not on Windows see <a href="https://forge.rust-lang.org/infra/other-installation-methods.html">"Other Installation Methods"</a>.
 tools-rustup-wsl-heading = Windows Subsystem for Linux
 tools-rustup-wsl = If you’re a Windows Subsystem for Linux user run the following in your terminal, then follow the on-screen instructions to install Rust.
 tools-rustup-unknown = Rust runs on Windows, Linux, macOS, FreeBSD and NetBSD. If you are on one of these platforms and are seeing this then please report an issue with the following values: