Added GitHub Actions as CI

.github/workflows/ci.yaml

@@ -0,0 +1,57 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  # build_and_test:
+  #   name: Build and test
+  #   runs-on: ${{ matrix.os }}
+  #   strategy:
+  #     matrix:
+  #       os: [ubuntu-latest, windows-latest, macOS-latest]
+  #       rust: [nightly-2019-09-03]
+  #   steps:
+  #   - name: Checkout master
+  #     uses: actions/checkout@master
+  #   - name: Install ${{ matrix.rust }} toolchain
+  #     uses: actions-rs/toolchain@v1
+  #     with:
+  #       toolchain: ${{ matrix.rust }}
+  #       override: true
+  #   - name: Running cargo check
+  #     uses: actions-rs/cargo@v1
+  #     with:
+  #       command: check
+  #       args: --all --bins --examples
+  #   - name: Running cargo check (unstable)
+  #     uses: actions-rs/cargo@v1
+  #     with:
+  #       command: check
+  #       args: --all --benches --bins --examples --tests
+  #   - name: Running cargo tests
+  #     uses: actions-rs/cargo@v1
+  #     with:
+  #       command: test
+  #       args: --all
+
+  check_fmt:
+    name: Check code formatting
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout master branch
+      uses: actions/checkout@master
+    - name: Install stable toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+    - name: Install rustfmt
+      run: |
+        rustup component add rustfmt
+        rustfmt --version
+    - name: Check formatting
+      run: cargo fmt --all -- --check