added circleci

Author: olf42

.circleci/config.yml

@@ -0,0 +1,18 @@
+version: 2
+jobs:
+  build:
+    docker:
+      - image: circleci/python:3.7.3-stretch
+    steps:
+      - checkout
+      - run:
+          name: Install Python dependencies in a venv
+          command: |
+            python3 -m venv venv
+            . venv/bin/activate
+            pip install -r requirements-dev.txt
+      - run: 
+          name: Run tests
+          command: |
+            . venv/bin/activate
+            make test