Added CI setup and PR templates

.github/CODEOWNERS

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+* @asantibanez

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. '...'
+2. '...'
+3. '...'
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Additional context**
+Add any other context about the problem here.
+
+**Solution Ideas**
+Initial thoughts or details about how this could be fixed

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature
+about: New feature idea
+
+---
+
+### Summary
+What's the new feature about? What should it do?
+
+### Proposal
+How should it work? API ideas?
+
+### Additional Notes
+Reference links or comments 

.github/PULL_REQUEST_TEMPLATE

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+## Summary
+
+[Provide a summary of the change.]
+
+## Issue
+
+[If exists, provide a link to the corresponding issue(s).]
+
+## Type of Change
+
+- [ ] :rocket: New Feature
+- [ ] :bug: Bug Fix
+- [ ] :hammer: Refactor
+- [ ] :question: [Other]
+
+## Screenshot/Video
+
+[Provide a screenshot or video that describes the change if applicable]

.github/workflows/phpunit.yml

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+name: PHPUnit
+
+on: [push]
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Cancel Previous Run
+        uses: styfle/cancel-workflow-action@0.6.0
+        with:
+          access_token: ${{ github.token }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '7.4'
+          extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, gd, exif, imagick, bcmath
+          coverage: none
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Install Composer dependencies
+        run: composer install --ignore-platform-reqs
+
+      - name: Run tests
+        run: ./vendor/bin/phpunit