diff --git a/images/ios_sequence_diagram.png b/images/ios_sequence_diagram.png
new file mode 100644
index 0000000..a02738c
Binary files /dev/null and b/images/ios_sequence_diagram.png differ
diff --git a/images/wxc_incoming_call.png b/images/wxc_incoming_call.png
new file mode 100644
index 0000000..de631a5
Binary files /dev/null and b/images/wxc_incoming_call.png differ