ci: setup GHA workflow (#210)

* ci: setup GHA workflow

* ci: delete travis workflow

* build: pin matplotlib version to 3.7

.github/workflows/CI.yml

@@ -0,0 +1,27 @@
+name: NeurodiffEq
+
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11"]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r requirements.txt
+          pip install matplotlib==3.7
+      - name: Test with pytest
+        run: |
+          pip install pytest pytest-cov
+          pytest --cov-report term --cov=neurodiffeq/
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3