Add workflows

.github/actions-rs/grcov.yml

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+branch: false
+ignore-not-existing: true
+llvm: true
+filter: covered
+output-type: lcov
+ignore:
+  - "*.cargo/*"
+excl-start: "grcov-excl-start"
+excl-stop: "grcov-excl-stop"
+excl-line: "grcov-excl-line|#\\[derive\\("

.github/workflows/build.yml

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+name: Build
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  test:
+    name: Test Suite
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        rust: [stable]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+
+      - uses: Swatinem/rust-cache@v1
+
+      - name: Run cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --release
+
+  lints:
+    name: Lints
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+        with:
+          submodules: true
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+
+      - uses: Swatinem/rust-cache@v1
+
+      - name: Run cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+      - name: Run cargo clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+      - name: Run rustdoc lints
+        uses: actions-rs/cargo@v1
+        env:
+          RUSTDOCFLAGS: "-D missing_docs -D rustdoc::missing_doc_code_examples"
+        with:
+          command: doc
+          args: --workspace --all-features --no-deps --document-private-items

.github/workflows/coverage.yaml

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+name: Code Coverage
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+jobs:
+  code-coverage:
+    name: Code Coverage
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources 
+        uses: actions/checkout@v1
+      - name: Install Rust toolchain 
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+      - name: Run tests with code coverage information 
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-features --no-fail-fast
+        env:
+          CARGO_INCREMENTAL: '0'
+          RUSTFLAGS: '-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests'
+          RUSTDOCFLAGS: '-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Cpanic=abort -Zpanic_abort_tests'
+      - name: Run grcov 
+        id: coverage
+        uses: rraval/grcov@master
+      - name: Coveralls upload
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          path-to-lcov: ${{ steps.coverage.outputs.report }}