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

Change-Id: Iffbbbc5bab0a8c30fa8f3c56fb000ec136b7bb5e
diff --git a/README b/README
new file mode 100644
index 0000000..df52222
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+The repo was migrated to https://git.trustedfirmware.org/mbedtls/tf-ci-scripts.git