diff --git a/step1.png b/step1.png
new file mode 100644
index 0000000000000000000000000000000000000000..403a1bb0687df0a1ae0be82f9cf7cd9aca9df517
Binary files /dev/null and b/step1.png differ
diff --git a/step2_promise_msg_log.png b/step2_promise_msg_log.png
new file mode 100644
index 0000000000000000000000000000000000000000..901f6ae083755953e006b3e96685d321db4a8f44
Binary files /dev/null and b/step2_promise_msg_log.png differ
diff --git a/step3_git_initialization.png b/step3_git_initialization.png
new file mode 100644
index 0000000000000000000000000000000000000000..8e3ab2a79c5b0e6ab283ebedfe42cd6c6f069011
Binary files /dev/null and b/step3_git_initialization.png differ
diff --git a/step4&step5.png b/step4&step5.png
new file mode 100644
index 0000000000000000000000000000000000000000..3e954f46fc6314257569c3180c4ef1e379f20c93
Binary files /dev/null and b/step4&step5.png differ