Feature add changelog (#9)

docs/changelog.md

+
+
+# V1.0.0-rc0
+
+2021-7-16
+
+## Feature
+
+### Platform management
+
+- Add account management
+- Add tenant, project management, and support level-by-level transfer of permissions
+- Support OpenAPI
+- Add record the operation audit log, supporting KubeCube  and K8s API Server
+- Support the component hotplug
+
+### K8s cluster management
+
+- Add permission management, based on K8s RBAC capability expansion
+- Add K8s cluster management and resource synchronization between clusters
+- Add tenant and namespace quota management
+
+### K8s resource management
+
+- Add workload management
+- Add service and discovery management
+- Add configuration management
+- Add PVC management
+- Add Yaml orchestration function
+
+### Observable
+
+- Add the prometheus monitoring function
+- Add fail alarm function
+- Add log collect and query function
+
+### Online operation and maintenance tools
+
+- Add terminal capabilities
+- Provide K8s fault diagnosis tool
+
+### Other non-functional
+
+- Provide All-in-One lightweight deployment mode and provide high-availability deployment mode in production environment 
+- Provide usage documentation, link [kubecube.io](https://www.kubecube.io/)
+- With single test and e2e test
+- Conduct laboratory stability and performance tests
+
+## Dependencies
+
+- hnc v0.8.0-kubecube.0.1
+- nginx-ingress v0.46.0
+- helm 3.x
+- metrics-server v0.4.1
+- elasticsearch 7.8
+- kubecube-monitoring 15.4.8
+- thanos 3.18.0
+- logseer v1.0.0
+- logagent v1.0.0
+- kubecube-audit 1.0.0-rc0
+