add github actions test

Author: sarahmish

.github/ISSUE_TEMPLATE.md

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+* PyGridSim version:
+* Python version:
+* Operating System:
+
+### Description
+
+Describe what you were trying to get done.
+Tell us what happened, what went wrong, and what you expected to happen.
+
+### What I Did
+
+```
+Paste the command(s) you ran and the output.
+If there was a crash, please include the traceback here.
+```

.github/workflows/tests.yml

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+name: Run Tests
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  docs:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install package
+      run: pip install .[dev]
+    - name: make docs
+      run: make docs
+
+  lint:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest, macos-latest]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install package and dependencies
+      run: pip install .[dev]
+    - name: make lint
+      run: make lint
+
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install package and dependencies
+      run: pip install .[test]
+    - name: make test
+      run: make test