diff --git a/doc/pic1.png b/doc/pic1.png new file mode 100644 index 0000000..a110a87 Binary files /dev/null and b/doc/pic1.png differ diff --git a/doc/pic2.png b/doc/pic2.png new file mode 100644 index 0000000..7676a54 Binary files /dev/null and b/doc/pic2.png differ