Add common files (#19)

instrumentors/dev-requirements.txt

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+pylint~=2.3
+flake8~=3.7
+isort~=4.3
+black>=19.3b0,==19.*
+mypy==0.740
+sphinx~=2.1
+sphinx-rtd-theme~=0.4
+sphinx-autodoc-typehints~=1.10.2
+pytest!=5.2.3
+pytest-cov>=2.8

instrumentors/pytest.ini

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+[pytest]
+addopts = -rs -v
+log_cli = true
+log_cli_level = warning

instrumentors/tox.ini

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+[tox]
+skipsdist = True
+skip_missing_interpreters = True
+envlist =
+; Environments are organized by individual package, allowing
+; for specifying supported Python versions per package.
+
+  py3{4,5,6,7,8}-test-flask
+  pypy3-test-flask
+
+  py3{4,5,6,7,8}-test-django
+  pypy3-test-django
+
+[testenv]
+deps =
+  -c dev-requirements.txt
+  test: pytest
+; FIXME: add coverage testing
+; FIXME: add mypy testing
+; FIXME: add lint testing
+; FIXME: add travis configuration
+
+changedir =
+  flask: flask/tests
+  django: django/tests
+
+commands_pre =
+; Install without -e to test the actual installation
+  python -m pip install -U pip setuptools wheel
+;  test: pip install {toxinidir}/flask
+  test: pip install {toxinidir}/utils/opentelemetry-auto-instrumentation
+  test: pip install {toxinidir}/utils/opentelemetry-ext-testutil
+
+  flask: pip install {toxinidir}/flask
+  flask: pip install {toxinidir}/flask[test]
+
+  django: pip install {toxinidir}/django
+  django: pip install {toxinidir}/django[test]
+
+commands =
+  test: pytest {posargs}