Add github issue templates for bug and feature request

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: Bug report
+labels: bug
+
+---
+
+### Prerequisites
+
+* Please check that a similar issue isn't already filed: https://github.com/issues?q=is%3Aissue+user%3Atriqs
+
+### Description
+
+[Description of the issue]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+or paste a minimal code example to reproduce the issue.
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+### Versions
+
+Please provide the application version that you used.
+
+You can get this information from copy and pasting the output of
+```bash
+python -c "from app4triqs.version import *; show_version(); show_git_hash();"
+```
+from the command line. Also, please include the OS you are running and its version.
+
+### Formatting
+
+Please use markdown in your issue message. A useful summary of commands can be found [here](https://guides.github.com/pdfs/markdown-cheatsheet-online.pdf).
+
+### Additional Information
+
+Any additional information, configuration or data that might be necessary to reproduce the issue.

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: Feature request
+labels: feature
+
+---
+
+### Summary
+
+One paragraph explanation of the feature.
+
+### Motivation
+
+Why is this feature of general interest?
+
+### Implementation
+
+What user interface do you suggest?
+
+### Formatting
+
+Please use markdown in your issue message. A useful summary of commands can be found [here](https://guides.github.com/pdfs/markdown-cheatsheet-online.pdf).