Include GitHub workflows and config by default.

.github/ISSUE_TEMPLATE.md

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+<!-- Provide a general summary of the issue in the Title above -->
+
+## Detailed description
+
+Provide a detailed description of the change or addition you are proposing.
+
+Make it clear if the issue is a bug, an enhancement or just a question.
+
+## Context
+
+Why is this change important to you? How would you use it?
+
+How can it benefit other users?
+
+## Possible implementation
+
+Not obligatory, but suggest an idea for implementing addition or change.
+
+## Your environment
+
+Include as many relevant details about the environment you experienced the bug in and how to reproduce it.
+
+* Version used (e.g. PHP 5.6, HHVM 3):
+* Operating system and version (e.g. Ubuntu 16.04, Windows 7):
+* Link to your project:
+* ...
+* ...

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+
+Describe your changes in detail.
+
+## Motivation and context
+
+Why is this change required? What problem does it solve?
+
+If it fixes an open issue, please link to the issue here (if you write `fixes #num`
+or `closes #num`, the issue will be automatically closed when the pull is accepted.)
+
+## How has this been tested?
+
+Please describe in detail how you tested your changes.
+
+Include details of your testing environment, and the tests you ran to
+see how your change affects other areas of the code, etc.
+
+## Screenshots (if appropriate)
+
+## Types of changes
+
+What types of changes does your code introduce? Put an `x` in all the boxes that apply:
+- [ ] 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 change)
+
+## Checklist:
+
+Go over all the following points, and put an `x` in all the boxes that apply.
+
+Please, please, please, don't send your pull request until all of the boxes are ticked. Once your pull request is created, it will trigger a build on our [continuous integration](http://www.phptherightway.com/#continuous-integration) server to make sure your [tests and code style pass](https://help.github.com/articles/about-required-status-checks/).
+
+- [ ] I have read the **[CONTRIBUTING](CONTRIBUTING.md)** document.
+- [ ] My pull request addresses exactly one patch/feature.
+- [ ] I have created a branch for this patch/feature.
+- [ ] Each individual commit in the pull request is meaningful.
+- [ ] I have added tests to cover my changes.
+- [ ] If my change requires a change to the documentation, I have updated it accordingly.
+
+If you're unsure about any of these, don't hesitate to ask. We're here to help!

.github/workflows/quality-assurance.yaml

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+---
+name: Quality assurance
+on:
+    push:
+        branches: ['master']
+    pull_request: ~
+
+jobs:
+    phpunit:
+        name: PHPUnit tests on ${{ matrix.php }} ${{ matrix.composer-flags }}
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: [ '8.1', '8.2', '8.3', '8.4' ]
+                composer-flags: [ '' ]
+                phpunit-flags: [ '--coverage-text' ]
+        steps:
+            - uses: actions/checkout@v2
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  coverage: xdebug
+                  tools: composer:v2
+            - run: composer install --no-progress ${{ matrix.composer-flags }}
+            - run: vendor/bin/phpunit ${{ matrix.phpunit-flags }}
+    phpstan:
+        name: PHPStan checks on ${{ matrix.php }}
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: [ '8.1', '8.2', '8.3', '8.4' ]
+                composer-flags: [ '' ]
+        steps:
+            - uses: actions/checkout@v2
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  coverage: xdebug
+                  tools: composer:v2
+            - run: composer install --no-progress ${{ matrix.composer-flags }}
+            - run: vendor/bin/phpstan