Add windows instructions

Author: jyn514

README.md

@@ -81,12 +81,20 @@ The build files are found in the `book` directory.
 We also test that line lengths are less than 100 columns. To test this locally,
 you can run `ci/check_line_lengths.sh`.
 
-You can also set this to run automatically with the following command:
+You can also set this to run automatically.
+
+On Linux:
 
 ```bash
 ln -s ../../ci/check_line_lengths.sh .git/hooks/pre-commit
 ```
 
+On Windows:
+
+```powershell
+cd .git/hooks && New-Item -Path ../../.git_hooks/* -ItemType SymbolicLink -Value . && cd ../..
+```
+
 ### Link Validations
 
 We use `mdbook-linkcheck` to validate URLs included in our documentation. To perform link checks, uncomment the `[output.linkcheck]` field in the `book.toml` configuration file and install `mdbook-linkcheck` with: