docs: roadmap item (#1519)

.github/ISSUE_TEMPLATE/roadmap.md

@@ -0,0 +1,49 @@
+---
+name: Roadmap
+about: Add a new item to the roadmap
+title: ''
+labels: 'roadmap'
+assignees: ''
+
+---
+
+# Abstract
+
+[ADD HERE]
+
+A 2-3 sentence description of the proposal.
+
+# Motivation
+
+[ADD HERE]
+
+Provide a motivation for including this proposal.
+
+# Specification
+
+[ADD HERE]
+
+Provide a high-level, functional specification. The specification should be focussed on what the proposal is trying to achieve.
+
+## [OPTIONAL]Extensions
+
+[OPTIONAL][ADD HERE]
+
+### [OPTIONAL][TITLE]
+
+[OPTIONAL][ADD HERE]
+
+# Reference Implementation
+
+[OPTIONAL][ADD HERE]
+
+Provide a reference implementation, proof of concept, or basic pseudo-code for a better grounds to discuss the suggested implementation. The reference implementation focusses on the how.
+
+# Security Considerations
+
+[ADD HERE]
+
+Provide reasoning around security implications:
+
+- The proposal itself
+- The propsals implications to the existing system