Add GitHub issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Use this if you observe a specific problem with pdfplumber's code or results
+title: ''
+labels: bug
+assignees: ''
+---
+
+## Describe the bug
+
+*A clear and concise description of what the bug is.*
+
+
+## Code to reproduce the problem
+
+*Paste it here, or attach a Python file.*
+
+
+## PDF file
+
+*Please attach any PDFs necessary to reproduce the problem.*
+
+*If you need to redact text in a sensitive PDF, you can run it through [JoshData/pdf-redactor](https://github.com/JoshData/pdf-redactor).*
+
+
+## Expected behavior
+
+*What did you expect the result __should__ have been?*
+
+
+## Actual behavior
+
+*What actually happened, instead?*
+
+
+## Screenshots
+
+*If applicable, add screenshots to help explain your problem.*
+
+
+## Environment
+
+- pdfplumber version: [e.g., 0.5.22]
+- Python version: [e.g., 3.8.1]
+- OS: [e.g., Mac, Linux, etc.]
+
+
+## Additional context
+
+*Add any other context/notes about the problem here.*

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature request
+about: Suggest a feature or improvement
+title: ''
+labels: feature-request
+assignees: ''
+---
+
+Please describe, in as much detail as possible, your proposal and how it would improve your experience with pdfplumber.

.github/ISSUE_TEMPLATE/troubleshooting.md

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+---
+name: Troubleshooting
+about: Ask for assistance in using pdfplumber
+title: ''
+labels: troubleshooting
+assignees: ''
+---
+
+## What are you trying to do?
+
+*A clear and concise description of your goals.*
+
+
+## What code are you using to do it?
+
+*Paste it here, or attach a Python file.*
+
+
+## PDF file
+
+*Please attach the PDFs used in the code.*
+
+*If you need to redact text in a sensitive PDF, you can run it through [JoshData/pdf-redactor](https://github.com/JoshData/pdf-redactor).*
+
+
+## Expected behavior
+
+*What did you expect the result __should__ have been?*
+
+
+## Actual behavior
+
+*What actually happened, instead?*
+
+
+## Screenshots
+
+*If applicable, add screenshots to help explain your problem.*
+
+
+## Environment
+
+- pdfplumber version: [e.g., 0.5.22]
+- Python version: [e.g., 3.8.1]
+- OS: [e.g., Mac, Linux, etc.]
+
+
+## Additional context
+
+*Add any other context/notes about the problem here.*
+