Create roadmap.

doc/roadmap.md

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+Kubernetes-entrypoint roadmap
+================================
+
+###Tests
+- [x] set Tavis CI
+- [ ] unit tests code coverage min. 75%
+- [ ] functional tests
+
+###Dependency management
+- [ ] Add dependency for deployment running on the same host
+- [ ] Add dependency for statefullsets running on the same host
+
+###New functionalities
+- [ ] Add debug output
+- [ ] Accept configuration via config file
+- [ ] Accept configuration via command line flags
+
+###Remove redundant functionality
+- [ ] Remove templating feature from kubernetes-entrypoint
+
+###Resolve known issues
+- [ ] In some cases service dependency is not honored
+
+###Developer experience
+- [ ] Add developer guide