Added .editorconfig

.editorconfig

@@ -0,0 +1,17 @@
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+indent_style = space
+tab_width = 4
+trim_trailing_whitespace = true
+
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+[composer.json]
+indent_style = tab
+indent_size = 4