Merge pull request #1654 from hzeller/add-editorconfig

Add .editorconfig to tell editors/IDEs basic whitespace rules.

Author: mithro

.editorconfig

@@ -0,0 +1,13 @@
+# Editor config file, see http://editorconfig.org/
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{h,c,cpp}]
+indent_style = space
+indent_size = 4
+