Add issue templates for bug reports, feature requests, and usage questions

Author: 0b10011

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help improve PHPWord
+labels: Bug Report
+
+---
+
+### Describe the Bug
+
+A clear and concise description of what the bug is.
+
+### Steps to Reproduce
+
+Please provide a code sample that reproduces the issue.
+
+```php
+<?php
+require __DIR__ . '/vendor/autoload.php';
+
+$phpWord = new \PhpOffice\PhpWord\PhpWord();
+$section = $phpWord->addSection();
+$section->...
+```
+
+### Expected Behavior
+
+A clear and concise description of what you expected to happen.
+
+### Current Behavior
+
+What is the current behavior?
+
+### Context
+
+Please fill in your environment information:
+
+- PHP Version:
+- PHPWord Version:

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: Change Request
+
+---
+
+### 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.

.github/ISSUE_TEMPLATE/how-to-use.md

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+---
+name: How to Use PHPWord
+about: Find out how to use PHPWord
+labels: WontFix
+
+---
+
+***Please do not use the issue tracker to ask how to use PHPWord.***
+
+Documentation is available on [Read the Docs](https://phpword.readthedocs.io/en/latest/).
+
+Sample code is in the [`/samples/` directory](https://github.com/PHPOffice/PHPWord/tree/develop/samples).
+
+Usage questions belong on [Stack Overflow](https://stackoverflow.com/questions/tagged/phpword).