added github actions

.github/workflows/ipynb.yml

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+name: celmech (ipynb)
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.10", "3.11"]
+
+    steps:
+      - uses: actions/checkout@v3
+      - 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 pytest matplotlib scipy 
+          pip install wheel setuptools
+      - name: Install Celmech 
+        run: |
+          pip install -e . -v 
+      - name: Running jupyter notebooks
+        run: |
+          cd jupyter_examples
+          python ipynb2py.py QuickstartExample.ipynb

.github/workflows/python.yml

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+name: celmech (python)
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Python tests on ${{ matrix.os }} (${{ matrix.python-version }})
+    timeout-minutes: 10
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+        os: [ubuntu-latest, macos-11]
+
+    steps:
+      - uses: actions/checkout@v3
+      - 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 pytest wheel setuptools numpy matplotlib 
+          pip install -e . -v 
+      - name: Output package contents
+        run: pip show celmech -vf
+      - name: Run unit tests
+        run: python -m unittest discover -s celmech/test/ -v

jupyter_examples/ipynb2py.py

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+import json
+import sys
+exec("import matplotlib as mpl")
+exec("mpl.use(\"Agg\")")
+
+if len(sys.argv)!=2:
+    print("Usage: ipynb2py.py FILENAME")
+    exit(1)
+with open(sys.argv[1]) as data_file:    
+    ipynb = json.load(data_file)
+
+code = ""
+for c in ipynb["cells"]:
+    if c["cell_type"] == "code":
+        source = c["source"]
+        for s in source:
+            if s[0] != "%":
+                code += s.rstrip('\n')+"\n"
+import socket
+try:
+    exec(code)
+except socket.error: 
+    print("A socket error occured. This is most likely due to a timeout in the NASA Horizons connections. We catch this exception here and ignore is.")
+    pass