add .editorconfig

Author: janwilmans

.editorconfig

@@ -0,0 +1,21 @@
+# top-most EditorConfig file
+root = true
+
+[*]
+trim_trailing_whitespace = true
+insert_final_newline = true
+end_of_line = crlf
+charset = latin1
+
+[*.cpp]
+indent_style = tab
+indent_size = 4
+
+[*.h]
+indent_style = tab
+indent_size = 4
+
+[*.rc]
+indent_style = space
+indent_size = 4
+