Add issue templates (#870)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please provide the following information:
+- The video or playlist url that is causing the error.
+- The code where the problem is occurring.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Output**
+If pytube raises an exception, please provide the full traceback for the exception.
+
+**System information**
+Please provide the following information:
+- Python version (run `python --version`)
+- Pytube version (run `print(pytube.__version__)` in python)
+- Command used to install pytube

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.