👷 add circleci

.circleci/config.yml

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+# Use the latest 2.1 version of CircleCI pipeline process engine. 
+# See: https://circleci.com/docs/2.0/configuration-reference
+version: 2.1
+
+orbs:
+  # The Node.js orb contains a set of prepackaged CircleCI configuration you can utilize
+  # Orbs reduce the amount of configuration required for common tasks. 
+  # See the orb documentation here: https://circleci.com/developer/orbs/orb/circleci/node
+  node: circleci/node@4.1
+
+
+jobs:
+  # Below is the definition of your job to build and test your app, you can rename and customize it as you want.
+  build-and-test:  
+    # These next lines define a docker executor: https://circleci.com/docs/2.0/executor-types/
+    # You can specify an image from Dockerhub or use one of our Convenience Images from CircleCI's Developer Hub.
+    # A list of available CircleCI docker Convenience Images are available here: https://circleci.com/developer/images/image/cimg/node
+    docker:
+      - image: cimg/node:15.1
+    # Then run your tests!
+    # CircleCI will report the results back to your VCS provider.
+    steps:
+      # Checkout the code as the first step.
+      - checkout
+      # Next, the node orb's install-packages step will install the dependencies from a package.json.
+      # The orb install-packages step will also automatically cache them for faster future runs.
+      - node/install-packages
+      # If you are using yarn instead npm, remove the line above and uncomment the two lines below.
+      # - node/install-packages:
+      #     pkg-manager: yarn 
+      - run:
+          name: Run tests
+          command: npm test
+
+workflows:
+  # Below is the definition of your workflow.
+  # Inside the workflow, you provide the jobs you want to run, e.g this workflow runs the build-and-test job above.
+  # CircleCI will run this workflow on every commit.
+  # For more details on extending your workflow, see the configuration docs: https://circleci.com/docs/2.0/configuration-reference/#workflows
+  sample: 
+    jobs:
+      - build-and-test
+      # For running simple node tests, you could optionally use the node/test job from the orb to replicate and replace the job above in fewer lines.
+      # - node/test