Add .editorconfig and .gitattributes files for project configuration

Author: muhammetsafak

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

@@ -0,0 +1,12 @@
+# Exclude development-only files from Composer dist tarballs.
+/.github                  export-ignore
+/.gitattributes           export-ignore
+/.gitignore               export-ignore
+/.editorconfig            export-ignore
+/.php-cs-fixer.dist.php   export-ignore
+/.phpunit.cache           export-ignore
+/docs                     export-ignore
+/tests                    export-ignore
+/phpstan.neon.dist        export-ignore
+/phpunit.xml              export-ignore
+/CHANGELOG.md             export-ignore