Initial rough implementation of a duplicate attestation check.

Author: ajsutton

README.md

@@ -0,0 +1,17 @@
+# Validator Monitor
+
+A side-car process that uses the standard beacon REST API to monitor for unhelpful, but not slashable validator behaviour.
+
+## Running
+
+Requires a sync'd beacon node the supports the standard REST API. Then run:
+
+```
+npm run start <beacon-node-url>
+```
+
+For example with a local teku:
+
+```
+npm run start http://localhost:5051
+```