Merge pull request swiftlang#21524 from apple/windows-git-usage

docs: add some notes on Windows source management

Author: compnerd

docs/WindowsBuild.md

@@ -30,16 +30,31 @@ it provides some of the needed headers and libraries.
   installation.
 
 ### 2. Clone the repositories
+1. Configure git to work with Unix file endings
 1. Create a folder to contain all the Swift repositories
 1. Clone `apple/swift-cmark` into a folder named `cmark`
 1. Clone `apple/swift-clang` into a folder named `clang`
 1. Clone `apple/swift-llvm` into a folder named `llvm`
 1. Clone `apple/swift-compiler-rt` into a folder named `compiler-rt`
 1. Clone `apple/swift` into a folder named `swift`
 1. Clone `apple/swift-corelibs-libdispatch` into a folder named `swift-corelibs-libdispatch`
+1. Clone `apple/swift-corelibs-foundation` into a folder name `swift-corelibs-foundation`
+
 - Currently, other repositories in the Swift project have not been tested and
   may not be supported.
 
+```cmd
+git config --global core.autocrlf input
+S:
+git clone https://github.com/apple/swift-cmark cmark
+git clone https://github.com/apple/swift-clang clang
+git clone https://github.com/apple/swift-llvm llvm
+git clone https://github.com/apple/swift-compiler-rt compiler-rt
+git clone https://github.com/apple/swift
+git clone https://github.com/apple/swift-corelibs-libdispatch
+git clone https://github.com/apple/swift-corelibs-foundation
+```
+
 ### 3. Acquire ICU
 1. Download ICU from [ICU Project](http://site.icu-project.org) for Windows x64 and extract the binaries.
 1. Add the `bin64` folder to your `Path` environment variable.