add draft default template for issues

Author: Régis Haubourg

.github/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps, sample datasets and qgis project file to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS and version: [e.g. Ubuntu 18.04, Windows 22]
+
+**QGIS version (please add information available in QGIS menu help/about)
+
+  - QGIS Version: [e.g. 3.4.5]
+  - Full library versions: [e.g QGIS code revision 58734527ab / Qt 5.9.5 / GDAL 2.3.2   etc..]  
+
+**Additional context**
+Add any other context about the problem here.

.github/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. Ex. QGIS would rock even more if [...]
+
+**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.
+Open source is community driven, please consider a way to support this work either by hiring developpers, supporting the QGIS project, find someone to submit a pull request. 
+If the change required is important, you should consider writing a QGIS Enhancement Proposal (QEP) or hiring someone to, and announce your work on the lists.