Add CI workflow for format checking and test execution (#71)

* Initial plan

* Add CI workflow to check formatting and run tests

Co-authored-by: michaelchu <540510+michaelchu@users.noreply.github.com>

* Add CI status badge to README

Co-authored-by: michaelchu <540510+michaelchu@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: michaelchu <540510+michaelchu@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  push:
+    branches: [ main, master, develop ]
+  pull_request:
+    branches: [ main, master, develop ]
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+
+    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 dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .
+        pip install pytest black
+
+    - name: Check code formatting with black
+      run: |
+        black --check optopsy/ tests/ setup.py
+
+    - name: Run tests with pytest
+      run: |
+        pytest tests/ -v

README.md

@@ -1,3 +1,4 @@
+[![CI](https://github.com/michaelchu/optopsy/actions/workflows/ci.yml/badge.svg)](https://github.com/michaelchu/optopsy/actions/workflows/ci.yml)
 [![Downloads](https://pepy.tech/badge/optopsy)](https://pepy.tech/project/optopsy)
 [![Black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/ambv/black)