add roadmap events for community and Survey

_roadmap/overall/2021-04-15-tasks.md

+---
+date: 2021-09-15
+title: Tasks in September 2021
+service: overall
+---
+
+## Publish [HIFIS Survey 2021](https://software.hifis.net/services/hifissurvey) Report
+Publish results of HIFIS survey.