Add process-proposal.md issue template (informalsystems#2401)

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,30 @@
+---
+name: Process Improvement
+about: For suggestions related to the process of how `ibc-rs` is shepherded.
+
+---
+
+<!-- < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < < ☺
+v                            ✰  Thanks for opening an issue! ✰
+v    Before smashing the submit button please review the template.
+v    Please also ensure that this is not a duplicate issue :)
+☺ > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >  -->
+
+## Proposal
+
+<!-- Describe your proposal for how the process of `ibc-rs` should be improved -->
+<!-- -->
+
+## Acceptance Criteria
+
+<!-- What's the definition of "done" for this issue? -->
+
+____
+
+## For Admin Use
+
+- [ ] Not duplicate issue
+- [ ] Appropriate labels applied
+- [ ] Appropriate milestone (priority) applied
+- [ ] Appropriate contributors tagged
+- [ ] Contributor assigned/self-assigned