Add .editorconfig

See https://editorconfig.org/ for more info.

Author: KOLANICH

.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+end_of_line = lf
+
+[CMakeLists.txt]
+indent_style = tab