DEV: Add issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Report a bug
+about: Something broke!
+title: ""
+labels: Bug
+assignees: MartinThoma
+
+---
+
+Replace this: What happened? What were you trying to achieve?
+
+## Environment
+
+Which environment were you using when you encountered the problem?
+
+```python
+$ python -m platform 
+# TODO: Your output goes here
+
+$ python -c "import PyPDF2;print(PyPDF2.__version__)"
+# TODO: Your output goes here
+```
+
+## Code
+
+This is a minimal, complete example that shows the issue:
+
+```python
+# TODO: Your code goes here
+```
+
+## PDF
+
+Share here the PDF file(s) that cause the issue. The smaller they are, the
+better. Let us know if we may add them to our tests!

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Request a Feature
+about: What do you think is missing in PyPDF2?
+title: ""
+labels: Feature Request
+assignees: MartinThoma
+---
+
+## Explanation
+
+Explain briefly what you want to achive.
+
+## Code Example
+
+How would your feature be used? (Remove this if it is not applicable.)
+
+```python
+from PyPDF2 import PdfFileReader, PdfFileWriter
+...  # your new feature in action!
+```