add issue template

ISSUE_TEMPLATE.md

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+# Issue template
+
+## Context
+
+**Please check:**
+
+- [ ] I've read the docs for [Wfuzz](http://wfuzz.readthedocs.io/)
+
+**Please describe your local environment:**
+
+Wfuzz version: Output of wfuzz --version
+
+Python version: Output of python --version
+
+OS: X
+
+## Report
+
+**What is the current behavior?**
+
+X
+
+**What is the expected or desired behavior?**
+
+X
+
+**Please provide steps to reproduce, including exact wfuzz command executed and output:**
+
+X
+
+**Other relevant information:**
+
+X