Configure CI for project

Co-Authored-By: Szymon Datko <szymon.datko@pwr.edu.pl>

Author: majsylw

.github/workflows/main.yml

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+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    container:
+      image: themattrix/tox
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2.0.0
+    - name: Tests
+      run: |
+          tox -v

tox.ini

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+[tox]
+minversion = 1.6
+skipsdist = True
+envlist = examples,flake8,autopep8
+
+[testenv]
+basepython = python3
+usedevelop = True
+install_command = pip install {opts} {packages}
+
+[testenv:examples]
+# Env variable MPLBACKEND=Agg prevents display of windows during tests
+deps = -r requirements.txt
+setenv =
+  MPLBACKEND=Agg
+commands =
+  python examples/test_Dudley.py
+  python examples/plot_Raman_response.py
+  python examples/test_gvd.py
+  python examples/test_spm.py
+  python examples/test_3rd_order_soliton.py
+  python examples/test_import_export.py
+  python examples/test_spm+gvd.py
+
+[testenv:flake8]
+deps = -r requirements.txt
+commands =
+  flake8
+
+[testenv:autopep8]
+deps = -r requirements.txt
+commands =
+  python -m autopep8 --recursive --aggressive --diff --exit-code .
+
+[flake8]
+exclude = .git,.tox