Create ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

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+This repository's issues are reserved for feature requests and bug reports.
+
+* **Type of issue**
+  - [ ] Bug report
+  - [ ] Feature request
+  - [ ] Other enhancement
+
+* **If the current behavior is a bug, please provide the steps to reproduce the problem:**
+  * **What is the current behavior?**
+  * **What is the expected behavior?**
+  * **Please tell us about your environment:**
+    (examples)
+    - version: `3.0-SNAPSHOT`
+    - 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`
+    - verilator version (if relevant)
+
+* **What is the use case for changing the behavior?**
+
+* **Impact**
+  - [ ] no functional change
+  - [ ] API addition (no impact on existing code)
+  - [ ] API modification
+  - [ ] unknown
+
+* **Development Phase**
+  - [ ] request
+  - [ ] proposal
+
+* **Other information** (e.g. detailed explanation, stacktraces, related issues, suggestions how to fix, links for us to have context, eg. Stack Overflow, gitter, etc)