update com.cn to io, add roadmap

Signed-off-by: 周鹏飞@yunify <pengfeizhou@yunify.com>

Signed-off-by: 周鹏飞@yunify <pengfeizhou@yunify.com>

Signed-off-by: 周鹏飞@yunify <pengfeizhou@yunify.com>

docs/roadmap.md

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+# KubeSphere Roadmap
+
+KubeSphere Roadmap demonstrates a list of open source product development plans and features being split by the edition and modules, as well as OpenPitrix community's anticipation. Obviously, it details the future's direction of OpenPitrix, but may change over time. We hope that can help you to get familiar with the project plans and vision through the Roadmap. Of course, if you have any better ideas, welcome to [Issues](https://github.com/kubesphere/kubesphere/issues).
+
+## Release Goals
+
+| Edition  | Schedule |
+|---|---|
+| Release Express| Jul, 2018 |
+| Release v1.0.0| Dec, 2018 |
+| Release v1.0.1| Jan, 2019 |
+| Release v2.0.0| May, 2019 |
+| Release v2.0.1| June, 2019|
+| Release v2.0.2| Jul, 2019 |
+| Release v2.1.0| Nov, 2019 |
+| Release v2.1.1| Feb, 2020 |
+| Release v3.0.0| Mar, 2020 |
+
+## Features
+
+### v2.1.1
+
+- [ ] Most of the work will be bugfix
+- [ ] Refactor RBAC in order to support future versions regarding third-party plugins with custom access control.
+- [ ] Refactor installer
+
+### v3.0.0
+
+#### Multi-cluster
+
+#### DevOps
+
+#### Observability
+
+#### Network
+
+#### Storage
+
+#### Security & Multitenancy
+
+#### Application Store (OpenPitrix)