examples: Extend example with basic trust schema (validator-config)

Change-Id: Iaf9f4abd57563e52cb167b55ba3b27d8ecc1ecd7
diff --git a/.gitignore b/.gitignore
index 8850587..724f671 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,4 @@
 
 # Other
 /VERSION.info
+/examples/example-trust-anchor.cert