Add github issue/PR templates (#1041)

.github/ISSUE_TEMPLATE/1_Bug_report.md

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+---
+name: "🐛 Bug Report"
+about: 'Report a general bug.'
+labels: bug
+
+---
+
+### Versions:
+- ide-helper Version: #.#.#
+- Laravel Version: #.#.# <!-- remove if not applicable -->
+- Lumen Version: #.#.# <!-- remove if not applicable -->
+- PHP Version: #.#.#
+
+### Description:
+
+<!--
+Please describe in detail the nature of the bug, code samples, etc.
+
+The more, the better.
+-->
+
+### Steps To Reproduce:
+
+- …

.github/ISSUE_TEMPLATE/2_Feature_request.md

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+---
+name: "✨ Feature request"
+about: 'Suggest a new feature or other improvements.'
+labels: enhancement
+
+---
+
+### Summary
+
+<!--
+Describe in detail what you propose, show (preferable) code examples and also signal if you're willing to work on it!
+-->

.github/ISSUE_TEMPLATE/3_Support_question.md

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+---
+name: "🙋🏼‍♂️ Support question"
+about: 'I need assistance or clarification on usage of this library.'
+labels: question
+
+---
+
+### Versions:
+- ide-helper Version: #.#.#
+- Laravel Version: #.#.# <!-- remove if not applicable -->
+- Lumen Version: #.#.# <!-- remove if not applicable -->
+- PHP Version: #.#.#
+
+### Question:
+

.github/PULL_REQUEST_TEMPLATE.md

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+## Summary
+<!-- Please provide an exhaustive description. -->
+
+## Type of change
+
+<!-- Please delete options that are not relevant. -->
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] This change requires a documentation update
+- [ ] Misc. change (internal, infrastructure, maintenance, etc.)
+
+### Checklist
+- [ ] Existing tests have been adapted and/or new tests have been added
+- [ ] Add a CHANGELOG.md entry
+- [ ] Update the README.md
+- [ ] Code style has been fixed via `composer fix-style`