Add a PHP interface to work with the language data

Additional changes in this PR include,

  * Added composer.json
  * Refactored the folder structure.
  * Added editorconfig.
  * Added PHPCS and formatted existing code.
  * Changes to use a single license - GPL-2.0-or-later
  * ESLint related fixes

Bug: T218639

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+indent_style = tab
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false