Added .gitattributes

.gitattributes

@@ -0,0 +1,13 @@
+# Path-based git attributes
+# https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
+
+# This way, the files would be available in the repository but it would not be downloaded when the package is required by another project.
+
+/.gitattributes     export-ignore
+/.gitignore         export-ignore
+/.php_cs.dist       export-ignore
+/.scrutinizer.yml   export-ignore
+/.travis.yml        export-ignore
+/CHANGELOG.md       export-ignore
+/phpunit.xml.dist   export-ignore
+/tests              export-ignore