SM-1399: Update the README for Windows on ARM instructions

README.md

@@ -20,10 +20,20 @@ are currently open as well as what it's like to work at Bitwarden.
 
 ## Getting Started
 
+### Linux / Mac / Windows
+
 ```bash
 cargo build
 ```
 
+### Windows on ARM
+
+To build, you will need the following in your PATH:
+
+- [Python](https://www.python.org)
+- [Clang](https://clang.llvm.org)
+  - We recommend installing this via [Visual Studio](https://learn.microsoft.com/en-us/cpp/build/clang-support-msbuild?view=msvc-170#install-1)
+
 ## Crates
 
 The project is structured as a monorepo using cargo workspaces. Some of the more noteworthy crates