added .github ci files

.github/bors.toml

@@ -0,0 +1,2 @@
+status = ["ci"]
+delete_merged_branches = true

.github/workflows/changelog.yml

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+on:
+  pull_request_target:
+
+name: Changelog check
+
+jobs:
+  changelog:
+    name: Changelog check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Changelog updated
+        uses: Zomzog/changelog-checker@v1.2.0
+        with:
+          fileName: CHANGELOG.md
+          noChangelogLabel: no changelog
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

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+on: push
+
+name: ci
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+        target:
+          - x86_64-unknown-linux-gnu
+          - thumbv6m-none-eabi
+          - armv7-unknown-linux-gnueabihf
+          - thumbv7em-none-eabihf
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+          components: rustfmt, clippy
+
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: check
+
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+      - uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: clippy
+          args: -- -D warnings