chore: initialize project using ramsey/php-library-starter-kit

.editorconfig

@@ -0,0 +1,16 @@
+# EditorConfig http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# This applies to all files
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml}]
+indent_size = 2