Add CI tests.

Also update the ignore file.

.github/workflows/build.yaml

@@ -0,0 +1,25 @@
+name: Lina
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-20.04, windows-latest]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.9", "pypy3.10"]
+      max-parallel: 4
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install py.test
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest
+    - name: Test package
+      run: pytest

.gitignore

@@ -8,3 +8,4 @@ htmlcov/*
 .coverage
 .pytest*
 .vscode*
+.venv