Remove old content, add README pointing to the new repo.

Change-Id: I06e9fe2d44eb408823b0124b5ba2884fdbbb75ba
Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
diff --git a/README b/README
new file mode 100644
index 0000000..c8769e8
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+The repo was migrated to https://git.trustedfirmware.org/ci/mbedtls/mbed-tls-job-configs.git