added CI and changelog

.github/bors.toml

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+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: build
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings
+
+  ci:
+      if: ${{ success() }}
+      # all new jobs must be added to this list
+      needs: [check, fmt, clippy]
+      runs-on: ubuntu-latest
+      steps:
+        - name: CI succeeded
+          run: exit 0

CHANGELOG.md

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+Change Log
+=======
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [unreleased]
+
+- First version of the HAL which adds the GPIO implementation