Add .editorconfig

Author: lucasmichot

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.php]
+charset = utf-8
+indent_style = space
+indent_size = 4
+
+[composer.json]
+indent_style = space
+indent_size = 4