merge INSTALL into CONTRIBUTING

CONTRIBUTING.md

@@ -1,27 +1,38 @@
-# Howdy!
+# Contributing
 
-Contributions are welcome! Please feel free to submit a Pull Request.
+Pull request contributions are welcome!
 
 For major changes, please open an issue first to discuss what you would like to change.
 
 Please make sure to update tests and documentation as appropriate.
 
 ## Building from Source
 
-Requirements:
+### On Windows
 
-- Node.js (supported version)
-- Python 3
-- Platform-specific C++ build tools:
-  - Windows: Visual Studio Build Tools
-  - macOS: Xcode Command Line Tools
-  - Linux: GCC and development headers
+When installing Node.js, on the "Tools for Native Modules" page, be sure to
+["Automatically install the necessary
+tools"](https://photostructure.com/server/photostructure-for-node/#step-2-install-nodejs).
+
+Also, in an Administrator PowerShell, run:
+
+    choco install llvm
+
+### On macOS
+
+Install the Xcode Command Line Tools, and then
+
+    brew install clang-format
+
+### On Ubuntu/Debian
+
+    sudo apt-get install build-essential clang-format libglib2.0-dev libblkid-dev uuid-dev
 
 ## Before submitting your PR
 
 Run `npm run precommit`, which:
 
-- re-formats your code,
+- reformats your code
 - runs the linter
 - compiles the native and typescript code, and finally
 - runs all the tests
@@ -33,4 +44,3 @@ into account both Windows and POSIX systems.
 - Windows on x64
 - glibc Linux on x64 and arm64, with or without Gnome GIO support
 - MUSL Alpine Linux on x64 and arm64
-