Install a "pledge wall" on a Joomla website

I am building a website for a well known charity, and they require a Pledge Wall installing on their Joomla website.

Examples of a pledge wall can be found here:

http://www.carersweek.org/get-involved/pledges-2016
http://www.time-to-change.org.uk/pledgewall

NOTE: This is not about simply installing an extension, it requires you to code the pledge wall input form, process the input and then display on the website.

This needs to be complete by 2 Nov 2016