chore: add .gitattributes file

.gitattributes

@@ -7,4 +7,18 @@
 /phpcs.xml.dist         export-ignore
 /phpstan-baseline.neon  export-ignore
 /phpstan.dist.neon      export-ignore
-/phpunit.dist.xml       export-ignore
\ No newline at end of file
+/phpunit.dist.xml       export-ignore
+# Ignore developer files when exporting
+.gitattributes         export-ignore
+.gitignore             export-ignore
+.gitlab-ci.yml         export-ignore
+.phive                 export-ignore
+captainhook.json       export-ignore
+phpcs.xml.dist         export-ignore
+phpstan-baseline.neon  export-ignore
+phpstan.dist.neon      export-ignore
+phpunit.dist.xml       export-ignore
+tests                  export-ignore
+
+# Explicitly set file type and line endings for PHP files, improves git diff output
+*.php     text eol=lf diff=php
\ No newline at end of file

.gitignore

 tools/
 phpstan.neon
 .phpunit.result.cache
+
+tools/