add EditorConfig file

Author: llaville

.editorconfig

@@ -0,0 +1,19 @@
+# EditorConfig is awesome: http://editorconfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.bat]
+end_of_line = crlf
+
+# PHP should follow the PSR-2 standard
+[*.php]
+indent_size = 4