tests | CI.yml for github workflow

.github/workflows/CI.yml

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+name: CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup Python # Set Python version
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    # Install pip and pytest
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install pytest
+        pip install pytest-cov codecov
+    - name: Test with pytest
+      run: |
+        pytest --cov=memocell --runslow
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v4