added correct suffix (.png)

diff --git a/doc/example_01.png b/doc/example_01.png
new file mode 100644 (file)
index 0000000..d383e60
Binary files /dev/null and b/doc/example_01.png differ

diff --git a/doc/example_02.png b/doc/example_02.png
new file mode 100644 (file)
index 0000000..dfb2e0c
Binary files /dev/null and b/doc/example_02.png differ

diff --git a/doc/example_03.png b/doc/example_03.png
new file mode 100644 (file)
index 0000000..57943f5
Binary files /dev/null and b/doc/example_03.png differ

diff --git a/doc/example_04.png b/doc/example_04.png
new file mode 100644 (file)
index 0000000..b4a55ed
Binary files /dev/null and b/doc/example_04.png differ