split issue templates [skip ci]

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a problem with Chipyard
+labels: bug
+
+---
+
+<!-- choose one -->
+**Impact**: rtl | software | unknown | other
+
+**What is the current behavior?**
+
+**What is the expected behavior?**
+
+**Please tell us about your environment:**
+<!--    (examples)
+    - version: `chipyard git commit hash`
+    - os: `Linux knight 4.4.0-92-generic #115-Ubuntu SMP Thu Aug 10 09:04:33 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux`
+    - other: `prior steps taken/documentation followed/...`
+-->
+
+**Other information**
+<!-- include detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, ... -->

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Propose a change to Chipyard
+
+---
+
+<!-- choose one -->
+**Impact**: rtl | software | unknown | other
+
+**Description**
+<!-- include detailed explanation, related issues, links for us to have context, ... -->

.github/ISSUE_TEMPLATE/other.md

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+---
+name: Other
+about: Something else!
+
+---
+

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question
+labels: question
+
+---
+
+<!-- have you looked at the Chipyard documentation? -->
+<!-- have you looked at the subproject documentation/githubs? -->
+<!-- for example: -->
+<!--   rocketchip: https://github.com/chipsalliance/rocket-chip/issues -->
+<!--   boom: https://github.com/riscv-boom/riscv-boom/issues -->
+<!--   firesim: https://github.com/firesim/firesim/issues -->