Add github workflow for continuous integration, untested.
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
new file mode 100644
index 0000000..6ddd66a
--- /dev/null
+++ b/.github/workflows/continuous-integration.yml
@@ -0,0 +1,10 @@
+name: continuous-integration
+on: [push]
+
+jobs:
+  all:
+#    runs-on: [ ubuntu-latest, windows-latest, macos-latest ]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: lukka/run-cmake@v3