Add issue templates

Author: marcelm

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Crashes, unexpected trimming behavior etc.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please provide enough information so that the issue can be reproduced.
+
+Include this information:
+- Cutadapt and Python version
+- How you installed the tool (e.g., Conda or pip)
+- Which command-line parameters you used
+
+If you report unexpected trimming behavior, this is also helpful:
+
+- An example input read (or read pair)
+- The output that Cutadapt produces
+- The output that you would have expected
+
+Feel free to delete this text before submitting your issue.

.github/ISSUE_TEMPLATE/feature-suggestion.md

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+---
+name: Feature suggestion
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+