Add "*:Zone.Identifier" to Windows .gitignore template to ignore Zone.Identifier ADS

[kjanat]

Summary
When files downloaded on Windows are copied into WSL, Windows "Zone.Identifier" alternate data streams can appear as separate files (filename:Zone.Identifier) in the repository and show up in git status. The Windows .gitignore template should include an entry to ignore these so they are not accidentally committed.

Problem

• Files downloaded from the web get a Zone.Identifier ADS on NTFS.
• When those files are copied into WSL (usually occurs when copying through windows explorer), the ADS can surface as separate files named like "example.txt:Zone.Identifier".
• These files are currently not ignored by the Windows template, so they appear in git status and can be accidentally added/committed.

Suggested change
Add an ignore pattern to the Windows template to cover Zone.Identifier ADS, e.g.:

# Windows alternate data streams created for downloaded files (Zone.Identifier)
*:Zone.Identifier

Current windows template

# Created by https://www.toptal.com/developers/gitignore/api/windows
# Edit at https://www.toptal.com/developers/gitignore?templates=windows

### Windows ###
# Windows thumbnail cache files
Thumbs.db
Thumbs.db:encryptable
ehthumbs.db
ehthumbs_vista.db

# Dump file
*.stackdump

# Folder config file
[Dd]esktop.ini

# Recycle Bin used on file shares
$RECYCLE.BIN/

# Windows Installer files
*.cab
*.msi
*.msix
*.msm
*.msp

# Windows shortcuts
*.lnk

# End of https://www.toptal.com/developers/gitignore/api/windows