Create issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help improve NBFC
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**System information**
+ - operating system
+ - NBFC version
+ - log files (see [NBFC files and directories overview](https://github.com/hirschmann/nbfc/wiki/Files-and-directories-overview))
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for NBFC
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+If you're about to request a config for a specific notebook model, please follow these steps before creating a new issue: [**Config requests**](https://github.com/hirschmann/nbfc/blob/master/CONTRIBUTING.md#config-requests)
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.