Add github actions workflows

.github/workflows/ci.yml

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+on: [push]
+
+jobs:
+  build_and_test:
+    name: Build and test on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+    - uses: actions/checkout@master
+
+    - name: Install nightly
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: nightly
+        override: true
+
+    - name: check
+      uses: actions-rs/cargo@v1
+      with:
+        command: check
+        args: --all --benches --bins --examples --tests
+
+    - name: check unstable
+      uses: actions-rs/cargo@v1
+      with:
+        command:  check
+        args: --features unstable --all --benches --bins --examples --tests
+
+    - name: tests
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+        args: --all --doc --features unstable
+
+  check_fmt_and_docs:
+    name: Checking fmt and docs
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+
+    - name: setup
+      run: |
+        rustup default nightly
+        rustup component add rustfmt
+        test -x $HOME/.cargo/bin/mdbook || ./ci/install-mdbook.sh
+        rustc --version
+    - name: mdbook
+      run: |
+        mdbook build docs
+    - name: fmt
+      run: cargo fmt --all -- --check
+
+    - name: Docs
+      run: cargo doc --features docs,unstable

.github/workflows/clippy.yml

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+on: push
+name: Clippy check
+jobs:
+  clippy_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - id: component
+        uses: actions-rs/components-nightly@v1
+        with:
+          component: clippy
+      - uses: actions-rs/toolchain@v1
+        with:
+            toolchain: ${{ steps.component.outputs.toolchain }}
+            override: true
+      - run: rustup component add clippy
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}