Add initial EditorConfig support

Handle *.c and *.h files.

Signed-off-by: Yegor Yefremov <[email protected]>
Signed-off-by: Corey Minyard <[email protected]>

Author: yegorich

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*]
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.c,*.h}]
+indent_style = space
+indent_size = 4