Added GitHub Actions CI.

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron:  '0 0 1 * *'
+
+jobs:
+  Linux:
+    name: Linux
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
+        cxx: [g++, clang++]
+      fail-fast: false
+    env:
+      CXX: ${{ matrix.cxx }}
+    steps:
+    - uses: actions/checkout@v2
+    - name: Before script
+      run: |
+        sudo apt-get -yqq update
+        sudo apt-get -yqq install cppcheck
+        $CXX --version
+    - name: Script
+      run: |
+        $CXX -Wall -g -fsanitize=address tables.cpp -o tables
+        ./tables
+        $CXX -Wall -g -fsanitize=address graphs.cpp -o graphs
+        ./graphs
+    - name: Cppcheck
+      run: cppcheck --enable=all .
+

README.md

@@ -1,4 +1,5 @@
 [![Build Status](https://travis-ci.com/tdulcet/Tables-and-Graphs.svg?branch=master)](https://travis-ci.com/tdulcet/Tables-and-Graphs)
+[![Actions Status](https://github.com/tdulcet/Tables-and-Graphs/workflows/CI/badge.svg?branch=master)](https://github.com/tdulcet/Tables-and-Graphs/actions)
 
 # Tables and Graphs