Add bootnodes for contextfree chain_spec

Author: RyuH1

assets/chain_spec_contextfree.json

@@ -2,7 +2,10 @@
   "name": "ContextFree Network",
   "id": "contextfree_network",
   "chainType": "Live",
-  "bootNodes": [],
+  "bootNodes": [
+    "/dns/cf-boot.ata.network/tcp/30333/ws/p2p/12D3KooWSuTq6MG9gPt7qZqLFKkYrfxMewTZhj9nmRHJkPwzWDG2",
+    "/dns/cf-boot.ata.network/tcp/30334/ws/p2p/12D3KooWMz5U7fR8mF5DNhZSSyFN8c19kU63xYopzDSNCzoFigYk"
+  ],
   "telemetryEndpoints": [
     [
       "/dns/telemetry.polkadot.io/tcp/443/x-parity-wss/%2Fsubmit%2F",