Add circle ci configs

Signed-off-by: Luiz Menezes <luiz.menezesf@gmail.com>

.circleci/config.yml

@@ -0,0 +1,56 @@
+version: 2
+workflows:
+  version: 2
+  test:
+    jobs:
+      - py36
+      - py37
+
+jobs:
+  py36: &test-template
+    working_directory: ~/repo
+    docker:
+      - image: circleci/python:3.6.6
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          key: v1-dependencies-{{ checksum "sismple_model/__version__.py" }}
+
+      - run:
+          name: Install test dependencies
+          command: |
+            python3 -m venv venv
+            . venv/bin/activate
+            pip install -r requirements-test.txt
+            pip install codecov
+
+      - save_cache:
+          paths:
+            - ./venv
+          key: v1-dependencies-{{ checksum "simple_model/__version__.py" }}
+
+      - run:
+          name: Linters
+          command: |
+            . venv/bin/activate
+            flake8 simple_model tests --ignore=E501
+            mypy simple_model
+
+      - run:
+          name: Run tests
+          command: |
+            . venv/bin/activate
+            pytest
+
+      - run:
+          name: codecov
+          command: |
+            . venv/bin/activate
+            codecov
+
+  py37:
+    <<: *test-template
+    docker:
+      - image: circleci/python:3.7.0