Design Pattern and component interaction diagram in Code Igniter

Today I got a new assignment based on CodeIgniter in which it is required to send a doc file( along with source code )containing

List of technologies and design patterns used.

An overall activity diagram.

An overall component interaction diagram.

And i don't know what to write in document file. I am really sorry for this silly question but I came to this first time and don't know what to do. Actually I stucked with the third one which is An overall component interaction diagram. Note:- I have completed coding part. Created this diagram as well