Added .gitattributes - Set shell files to always have LF line ending to avoid build issues on Windows

[MichaelLeeHobbs]

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)

Proposed changes

Added a .gitattributes to avoid build issues when git on Windows is configured to check out with CRLF.

Checklist

• [x] I have read the contribution guidelines
• [ ] For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• [x] I have run grunt to verify the unit tests pass
• [ ] I have added suitable unit tests to cover the new/changed functionality N/A

[linux-foundation-easycla[bot]]

The committers are authorized under a signed CLA.

• :white_check_mark: Michael Hobbs (68c85259fdcfd7b4ee990fc657e8c660941b652a)

[hardillb]

Thanks for this.

Just out of interest can you let me know how it fails on Windows?