Create automated build workflow

.github/workflows/dart.yml

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+name: Dart
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    # Note that this workflow uses the latest stable version of the Dart SDK.
+    # Docker images for other release channels - like dev and beta - are also
+    # available. See https://hub.docker.com/r/google/dart/ for the available
+    # images.
+    container:
+      image:  cirrusci/flutter:stable
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Print Dart SDK version
+        run: dart --version
+
+      - name: Install dependencies
+        run: flutter pub get
+
+      # Uncomment this step to verify the use of 'dart format' on each commit.
+      # - name: Verify formatting
+      #   run: dart format --output=none --set-exit-if-changed .
+
+      # Consider passing '--fatal-infos' for slightly stricter analysis.
+      - name: Analyze project source
+        run: dart analyze
+
+      # Your project will need to have tests in test/ and a dependency on
+      # package:test for this step to succeed. Note that Flutter projects will
+      # want to change this to 'flutter test'.
+      - name: Run tests
+        run: flutter test