Create six-month-review.md

Added issue template

.github/ISSUE_TEMPLATE/six-month-review.md

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+---
+name: Six monthly review
+about: Review of previous six months and plan for next 6 months
+title: Review of ??? to ??? and plan for ??? to ???
+labels: ''
+assignees: tms-epcc
+
+---
+
+- [ ] Create Zenhub epic for this cycle's six-month plan
+- [ ] Create tickets for latest 6 month objectives if necessary 
+- [ ] Review previous 6 month plan Epic kanban 
+    - [ ] close tickets, remove duplicates as necessary	
+   - [ ] Shift any outstanding tickets from previous plan if appropriate
+- [ ] Identify any  task/ milestone/ deliverable dependencies with other LSST:UK WP tasks.
+- [ ] Review the WP Brief  * are any updates required?  
+- [ ] Review the associated [SRD requirements](https://lsst-uk.atlassian.net/wiki/spaces/LUSCSWG/pages/614465537/LSST+UK+Science+Requirements+Document) 
+- [ ] Review risks
+    * Is any escalation required?
+    * Are there risks for those tasks/ tickets/  dependencies, … on the critical path?
+- [ ] Review opportunities register
+   * Add new opportunities