Switch from Travis/Appveyor to Github Actions for CI (#16)

Author: bovine

.github/workflows/linux-ci.yml

@@ -0,0 +1,19 @@
+name: Linux CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: make
+      run: make
+    - name: make test
+      run: make test

.github/workflows/windows-ci.yml

@@ -0,0 +1,32 @@
+name: Windows CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  # Path to the solution file relative to the root of the project.
+  SOLUTION_FILE_PATH: .
+
+  # Configuration type to build.
+  # You can convert this to a build matrix if you need coverage of multiple configuration types.
+  # https://docs.github.com/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
+  BUILD_CONFIGURATION: Release
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Configure
+      run: mkdir build && cd build && cmake ..
+
+    - name: Build
+      run: cmake --build build --config ${{env.BUILD_CONFIGURATION}} -- /property:Prefer32bit=false /p:Platform=x64
+
+    - name: Test
+      run: build\${{env.BUILD_CONFIGURATION}}\metar_test.exe

.travis.yml

@@ -1,5 +1,5 @@
-[![Build Status](https://travis-ci.org/flightaware/mdsplib.svg?branch=master)](https://travis-ci.org/flightaware/mdsplib)
-[![Build status](https://ci.appveyor.com/api/projects/status/b04xo1u432ttg8i4/branch/master?svg=true)](https://ci.appveyor.com/project/snoe925/mdsplib/branch/master)
+![Linux CI](https://github.com/flightaware/mdsplib/workflows/Linux%20CI/badge.svg)
+![Windows CI](https://github.com/flightaware/mdsplib/workflows/Windows%20CI/badge.svg)
 
 METAR Decoder Software Package Library
 ===