The Doc Viewer app is currently not in the image, so no screenshots there.
In order to get started we’ve come up with some suggestions for new developers.
First off get your development environment setup as documented at http://developer.ubuntu.com/apps/create/get-the-sdk/ which you can do either natively on Ubuntu 13.10 or 14.04 or in a Virtual Machine if you prefer.
If you have a Nexus device, you could either replace the legacy OS with Ubuntu using either of these guides – https://wiki.ubuntu.com/Touch/Install or https://wiki.ubuntu.com/Touch/DualBootInstallation.
Next up take a look at some of these suggestions based on your area of interest and skill level.
We welcome translations for all our Core Apps. If that’s if interest you can find everything you need at https://translations.launchpad.net/ubuntu-clock-app and https://translations.launchpad.net/ubuntu-docviewer-app.
If you find bugs in the apps you can look for existing bugs to confirm or fix at https://bugs.launchpad.net/ubuntu-clock-app/+bugs and https://bugs.launchpad.net/ubuntu-docviewer-app/+bugs, or file new bugs at https://bugs.launchpad.net/ubuntu-clock-app/+filebug and https://bugs.launchpad.net/ubuntu-docviewer-app/+filebug
You may find some bugs which have yet to be confirmed or triaged, we’d love your help there too.
You’ll find out-standing merge proposals on launchpad at https://code.launchpad.net/ubuntu-clock-app/+activereviews and https://code.launchpad.net/ubuntu-docviewer-app/+activereviews.
If you’d like to take on a task then we have some work items in the blueprints which you can assign to yourself and get cracking on at https://blueprints.launchpad.net/ubuntu-phone-commons/+spec/coreapps-1404-clock-dev and https://blueprints.launchpad.net/ubuntu-phone-commons/+spec/coreapps-1404-docviewer-dev
You can find out more about the Core Apps Hack Days at the links at the top, and you’ll find all of us hanging out on #ubuntu-app-devel on freenode.