TFM : Adding dockerfiles used to build tfm locally

This patch adds 3 new dockerfiles and scripts used to launch the
containers and build the tfm project locally. the 3 files are tfm_core,
clang and documents. the documents and clang images both depend on
tfm_core. Windows and Linux scripts are included to build and launch the
images.

Signed-off-by: Hugo L'Hostis <hugo.lhostis@arm.com>
Change-Id: Ib2f79deec20b131a88be6740a4556f041530ca9a
23 files changed