Create bug.md (#213)

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Maigret bug report
+about: I want to report a bug in Maigret functionality
+title: ''
+labels: bug
+assignees: soxoj
+
+---
+
+## Checklist
+
+- [ ] I'm reporting a bug in Maigret functionality
+- [ ] I've checked for similar bug reports including closed ones
+- [ ] I've checked for pull requests that attempt to fix this bug
+
+## Description
+
+Info about Maigret version you are running and environment (`--version`, operation system, ISP provuder):
+<INSERT VERSION INFO HERE>
+
+How to reproduce this bug (commandline options / conditions):
+<INSERT EXAMPLE OF CLI COMMAND HERE>
+
+<DESCRIPTION>