Update issue templates

Author: facontidavide

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Help me help you...
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+If you are experiencing a crash, provide a backtrace (GDB or similar).
+
+*How to Reproduce**
+
+Please provide a specific description of how to reproduce the issue or source code that can be compiled and executed. Please attach a file/project that is easy to compile, don't copy and paste code snippets!
+
+Even better, create a Pull Request with a failing unit test.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.