add epic and milestone templates

.github/ISSUE_TEMPLATE/epic.md

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+---
+name: Epic Issue Template
+about: Track Epics
+title: "[Epic] "
+labels: epic
+assignees: ''
+
+---
+
+
+<!-- Use GitHub Project fields "due date" and "planned start" to set dates -->
+**Epic label**: `E:...`
+
+# Summary
+
+<!-- Provide a high level summary of the Epic -->  
+
+# Acceptance Criteria
+
+<!-- describe the deliverable of this milestone and its attributes in plain English -->
+
+# Tasks
+
+<!-- can be generated using the `epics` command of https://github.com/fryorcraken/milestone-update/ -->
+<!--
+
+Breakdown of the work
+
+- [ ] research: ...
+- [ ] nwaku: ...
+
+-->
+

.github/ISSUE_TEMPLATE/milestone.md

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+---
+name: Milestone Issue Template
+about: Track Key Milestones
+title: "[Milestone] "
+labels: milestone
+assignees: ''
+
+---
+
+2023 Key Milestones: https://notes.status.im/s/iylE6wdli#
+
+**Milestone**: <!-- URL to the GitHub Milestone -->
+<!-- Remove tracks as needed -->
+**Priority Tracks**: Secure Scalability, Production Readiness, Growth, Generating Revenue (Sustainability & Longevity).
+
+# Summary
+
+<!-- Provide a high level summary of the Milestone -->  
+
+# Justification
+
+<!-- Justify the Milestone in the context of the priority tracks and project/collective strategies -->
+
+# RAID (Risks, Assumptions, Issues and Dependencies)
+
+<!-- List dependencies on other milestones (avoid dependencies on tasks) -->
+
+<!-- List dependencies on other teams -->
+
+<!-- List any risks or assumptions that will be cleared as work progresses -->
+
+<!-- List any GitHub issues that tracks any blocker or any of the items above -->