add .editorconfig

Author: ildyria

.editorconfig

@@ -0,0 +1,22 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = false
+indent_style = tab
+indent_size = 4
+trim_trailing_whitespace = true
+
+[composer.json]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.js]
+indent_style = tab
+indent_size = 4