Hello Github Actions

.github/workflows/crystal.yml

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+name: Crystal CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    container:
+      image: crystallang/crystal
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install dependencies
+      run: shards install
+    - name: Code formatting
+      run: crystal tool format --check
+    - name: Code inspection with ameba
+      run: bin/ameba src
+    - name: Run specs
+      run: crystal spec -v