process #00(github): Add a GitHub workflow for CI

.github/workflows/ci.yaml

@@ -0,0 +1,22 @@
+name: Node.js CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x, 15.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm ci
+    - run: npm run build --if-present
+    - run: npm test

README.md

@@ -1,6 +1,8 @@
 jline
 =====
 
+![CI](https://github.com/bitdivine/jline/actions/workflows/ci.yaml/badge.svg)
+
 Sort, grep and join files where every line is JSON.  JSON has long surpassed CSV as the most common, useful and robust format in much of the code that I encounter but as yet it has no parallel to the array of fine tuned command line tools that target CSV.  This collection fills some of the gaps.
 
 The JSON lines format is formally described at [http://jsonlines.org/](http://jsonlines.org/).  Other pages of interest are [Wikipedia](https://en.wikipedia.org/wiki/Line_Delimited_JSON) and [Newline Delimited JSON](http://trephine.org/t/index.php?title=Newline_delimited_JSON).
@@ -79,4 +81,4 @@ Use `--help` or refer to the markdown files:
 ## Support on Beerpay
 Hey dude! Help me out for a couple of :beers:!
 
-[![Beerpay](https://beerpay.io/bitdivine/jline/badge.svg?style=beer-square)](https://beerpay.io/bitdivine/jline)  [![Beerpay](https://beerpay.io/bitdivine/jline/make-wish.svg?style=flat-square)](https://beerpay.io/bitdivine/jline?focus=wish)
+[![Beerpay](https://beerpay.io/bitdivine/jline/badge.svg?style=beer-square)](https://beerpay.io/bitdivine/jline)  [![Beerpay](https://beerpay.io/bitdivine/jline/make-wish.svg?style=flat-square)](https://beerpay.io/bitdivine/jline?focus=wish)