Added CI action to run linters on GH, added flake8 configuration file

.flake8

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+[flake8]
+exclude = .git,__pycache__,venv,./.venv,dist,examples,build

.github/workflows/main.yml

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+name: Testing and linting
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ["3.12"]
+        python-version: ["3.11"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          allow-prereleases: true
+      - name: Install dependencies
+        run: |
+          python3 -m pip install --upgrade pip setuptools
+          python3 -m pip install pytest 
+          python3 -m pip install git+https://github.com/typemytype/GlyphConstruction.git
+          python3 -m pip install flake8
+          python3 -m pip install ruff
+      - name: Run pytest tests
+        run: |
+          python3 tests/setuptestdata.py
+          pytest --full-trace -v
+      - name: Lint with flake8
+        run: |
+          # stop the build if there are Python syntax errors or undefined names
+          flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+          # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+          flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+      - name: Lint with ruff
+        run: |
+          ruff check