Add .gitattributes file

[hans-thomas]

Create the .gitattributes file to prevent downloading useless test files by devs.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[DenTray]

@hans-thomas could you please describe practical application of this change?

[hans-thomas]

When developers install this package using Composer, all the test files and some other unwanted files download into their vendor folder. It's the best way to reduce package size on downloads and also, ables us to add more and bigger test files.

[DenTray]

When developers install this package using Composer, all the test files and some other unwanted files download into their vendor folder. It's the best way to reduce package size on downloads and also, ables us to add more and bigger test files.

@hans-thomas great! thanks! Something went wrong when I tried to check it earlier but now all works as you described!