Add programs directory in tf-psa-crypto directory

Add programs directory in tf-psa-crypto directory
for the tree in the directory to looks like a
TF-PSA-Crypto root tree as expected by
build_tree.py.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tf-psa-crypto/programs/.gitignore b/tf-psa-crypto/programs/.gitignore
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tf-psa-crypto/programs/.gitignore