RFC template for nominating CSRs to be write-safe

.github/ISSUE_TEMPLATE/-riscv---nominate-csr-to-be--write--safe.md

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+---
+name: "`riscv`: Nominate CSR to be `write` safe"
+about: Suggest to make writes of a given CSR safe
+title: "`riscv`: make [CSR] write-safe"
+labels: ''
+assignees: ''
+
+---
+
+**Which CSR do you want to nominate as `write` safe?**
+Indicate which CSR you want to be `write` safe. Ex. `mepc`
+
+**Does a CSR write introduce potential memory safety issues in safe code? Please describe.**
+A clear and concise justification on why writing to this CSR will **never** introduce memory safety issues in safe code.
+
+**Does a CSR write introduce potential undefined behavior in safe code? Please describe.**
+A clear and concise justification on why writing to this CSR will **never** lead to undefined behavior in safe code.
+
+**Does a CSR write invalidate invariants in safe code?**
+A clear and concise justification on why writing to this CSR will **never** invalidate invariants in safe code.
+
+**Additional context**
+Please feel free to add any other context or screenshots about your request here.