Add CircleCI building

.circleci/config.yml

@@ -0,0 +1,50 @@
+version: 2.1
+
+commands:
+  test-nodejs:
+    steps:
+      - run:
+          name: Versions
+          command: npm version
+      - checkout
+      - restore_cache:
+          keys:
+            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-{{ arch }}-npm-cache-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}
+            - v{{ .Environment.CIRCLE_CACHE_VERSION }}-{{ arch }}-npm-cache-master-{{ .Environment.CIRCLE_JOB }}
+      - run:
+          name: Install dependencies
+          command: npm ci
+       - run:
+         name: NPM Audit
+         command: npm audit --audit-level=moderate
+      - run:
+          name: Test
+          command: npm test
+      - save_cache:
+          key: v{{ .Environment.CIRCLE_CACHE_VERSION }}-{{ arch }}-npm-cache-{{ .Branch }}-{{ .Environment.CIRCLE_JOB }}-{{ checksum "package-lock.json" }}
+          paths:
+            - ~/.npm/_cacache
+
+jobs:
+  node-v8:
+    docker:
+      - image: circleci/node:8
+    steps:
+      - test-nodejs
+  node-v10:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - test-nodejs
+  node-v12:
+    docker:
+      - image: circleci/node:12
+    steps:
+      - test-nodejs
+
+workflows:
+  node-multi-build:
+    jobs:
+      - node-v8
+      - node-v10
+      - node-v12

README.md

@@ -1,4 +1,5 @@
 [![npm package](https://badge.fury.io/js/oidc-client.svg)](https://www.npmjs.com/package/oidc-client)
+[![CircleCI](https://circleci.com/gh/IdentityModel/oidc-client-js/tree/dev.svg?style=svg)](https://circleci.com/gh/IdentityModel/oidc-client-js/tree/dev)
 
 # oidc-client