dpdk: add support for DPDK and DPDK L3fwd application

Add the following files:
setup.sh - installs dependencies for all the components of the
           solution. Currently, dependencies for DPDK are added.
build.sh - builds all the components of the solution. Currently,
           builds DPDK.
quickstart.md - provides instructions on how to get started
CHANGELOG.md - contains the changes made in each release.
README.md - provides a brief introduction to the dataplane stack solution

Signed-off-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Nathan Brown <nathan.brown@arm.com>

Change-Id: I8347ee52a3ba0562db61a24ae646f147a7a463c1