add TODO.md

Author: smallnest

TODO.md

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+# rpcx 
+
+Milestone 6.0
+
+### Todo
+
+- [ ] improve message.Encode to avoid copy header and payload [#399]
+- [ ] Users can customize the failure of calls [#396]
+- [ ] improve rpcx-gateway 6.0 feature [#390]
+- [ ] improve rust lib [#389]
+- [ ] add rpc request replay [#417]
+- [ ] support sub/pub [#415]
+- [ ] avoid too many connects after disconnected [#411]
+- [ ] re-register services if registery center has recovered [#420]
+
+### In Progress
+
+
+### Done ✓
+
+- [x] can't get latest nodes for nacos [#422]
+- [x] add k8s deployment yaml [#355]