Add changelog

CHANGELOG.md

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+# Changes
+
+## Release v0.2
+
+This second release makes Flux easier to deploy and operate by merging
+the agent and balancer into `fluxd`; and, refines its service model
+and user interfaces.
+
+*Highlights*:
+
+ * Merge the balancer and agent into one binary `fluxd` (and one container image)
+ * Send heartbeat for host from `fluxd`, and report live hosts in `fluxctl info`
+ * `fluxd`: withdraw instances that fail connections, and schedule retries with a backoff
+ * `flux web`: Show each charts alongside its instance (or group), rather than all together
+ * `fluxd`: Survive restarts of etcd, rather than crashing
+ * Simplify the way instances are assigned addresses, making it a global setting
+ * Make instances that cannot be given an address visible, to help troubleshooting
+
+Between releases, we have improved the documentation, among other
+things adding a "Get Started" guide.
+
+## Release v0.1
+
+The initial release provides scripts and container images needed to
+run Flux.