Implement skeleton network/sync framework.

beacon_node/libp2p/src/service.rs

@@ -0,0 +1,11 @@
+use slog::debug;
+
+/// The configuration and state of the libp2p components for the beacon node.
+pub struct Service {}
+
+impl Service {
+    pub fn new(log: slog::Logger) -> Self {
+        debug!(log, "Service starting");
+        Service {}
+    }
+}