Add a CHANGELOG file

CHANGELOG.md

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+2020-11-12 v0.6.2
+=================
+
+A bugfix release addressing issues discovered in the Toledo network.
+
+New additions:
+
+* Added an estimated syncing time to the beacon node status bar.
+
+* Added metadata for the upcoming Pyrmont network. This will be a
+  short-lived network with parameters very closely resembling mainnet.
+
+* Switched to version 1.1 of the GossipSub protocol.
+
+* Added an JSON-RPC method `setLogLevel` for dynamically changing the
+  log level of selected components at run-time.
+
+Bug fixes:
+
+* Fixed a bug preventing the node from proposing blocks when connected
+  to a web3 provider
+
+* Fixed an invalid "corrupted database" error message appearing on start-up
+
+* Fixed incorrectly set message-ids in gossip message causing other clients
+  to penalise and potentially disconnect our nodes from the network.
+
+* Improved the behaviour of Nimbus when paired with a Geth node which is not
+  fully synced.
+
+
+2020-11-09 Hope (v0.6.0)
+========================
+
+`Nimbus eth2` 0.6.0 was the first externally audited and stable release
+of our beacon node software. When compared to the 0.5x series, it features
+significant reductions in storage and memory requirements, a faster sync
+speed, and a plethora of usability and security enhancements across the
+board. Under normal network conditions, the delivery rate of attestations
+and block proposals is expected to be above 99%. Going forward, our release
+schedule will start to accelerate, with multiple new releases expected before
+the Eth2 mainnet launch.
+
+Changelog highlights include:
+
+* Full support for the 1.0 Eth2 phase0 spec and the monitoring of the
+  mainnet validator deposit contract.
+
+* LibP2P and GossipSub fixes which drastically improve the delivery of
+  attestations and blocks (nearly 100% expected rate of delivery).
+
+* Fixes for all major resource leaks: you no longer need to restart your
+  node to improve its performance.
+
+* Efficient caching and storage mechanisms: ensures our memory consumption
+  remains comparatively low both during smooth and turbulent network conditions.
+
+* Several storage and networking optimisations leading to an order of magnitude
+  improvement in beacon chain sync speed.
+
+* Audits to our codebase by ConsenSys Diligence, NCC Group and Trail of Bits.
+  More than 60 of the security findings have already been addressed.
+  The remaining items will be resolved before mainnet launch.
+
+* Support for pairing with a locally running Geth instance to allow for
+  decentralised monitoring of the validator deposit contract.
+
+* An extensive user guide for managing the beacon node.
+
+* Slashing protection mechanisms + database.
+
+* Support for storing the validator signing keys in a separate process, isolated
+  from the network, with a minimal attack surface.
+