Add a CircleCI config file

[kienstra]

• Adds a CircleCI config file
• Does npm test and npm run build

For #4

[kienstra]

Hi @ikovac,
As mentioned, here's a PR to set up CircleCI.

getlocalci#1 shows the jobs passing.

Will package.json have a lint script, maybe with eslint or prettier?

If so, this could run it with:

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 81cbbef..83ce87a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,5 +7,7 @@ workflows:
   test-lint:
     jobs:
       - node/test
+      - node/run:
+          npm-run: lint
       - node/run:
           npm-run: build

[ikovac]

@kienstra Yeah, the plan is to add eslint: #3. I will add eslint rule after I finish that ticket.
Thank you for your work!