Add Github Actions for CI

.github/workflows/CI.yml

@@ -0,0 +1,24 @@
+name: Run tests
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        julia-version: ['1.0', '1.4', 'nightly']
+        julia-arch: [x64]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+      - uses: actions/checkout@v1.0.0
+      - name: "Set up Julia"
+        uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: ${{ matrix.julia-arch }}
+      - name: "Build package"
+        uses: julia-actions/julia-buildpkg@master
+      - name: "Run tests"
+        uses: julia-actions/julia-runtest@master

README.md

@@ -7,5 +7,7 @@ Linux and macOS: [![Build Status](https://travis-ci.org/JuliaLang/Example.jl.svg
 
 Windows: [![Build Status](https://ci.appveyor.com/api/projects/status/github/JuliaLang/Example.jl?branch=master&svg=true)](https://ci.appveyor.com/project/tkelman/example-jl/branch/master)
 
+Github Actions: ![Build status](https://github.com/JuliaLang/Example.jl/workflows/Run%20tests/badge.svg)
+
 [![Coverage Status](https://coveralls.io/repos/JuliaLang/Example.jl/badge.svg?branch=master)](https://coveralls.io/r/JuliaLang/Example.jl?branch=master)
 [![codecov.io](http://codecov.io/github/JuliaLang/Example.jl/coverage.svg?branch=master)](http://codecov.io/github/JuliaLang/Example.jl?branch=master)