Initial set up

.codespellrc

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+# See: https://github.com/codespell-project/codespell#using-a-config-file
+[codespell]
+builtin = clear,informal,en-GB_to_en-US
+# In the event of a false positive, add the problematic word, in all lowercase, to a comma-separated list here:
+ignore-words-list = ,
+check-filenames =
+check-hidden =
+skip = ./.git

.ecrc

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+{
+  "Exclude": ["LICENSE.txt"]
+}

.editorconfig

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+# See: https://editorconfig.org/
+# The formatting style defined in this file is the official standardized style to be used in all Arduino projects and
+# should not be modified.
+# Note: indent style for each file type is defined even when it matches the universal config in order to make it clear
+# that this type has an official style.
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{adoc,asc,asciidoc}]
+indent_size = 2
+indent_style = space
+
+[*.{bash,sh}]
+indent_size = 2
+indent_style = space
+
+[*.{c,cc,cp,cpp,cxx,h,hh,hpp,hxx,ii,inl,ino,ixx,pde,tpl,tpp,txx}]
+indent_size = 2
+indent_style = space
+
+[*.go]
+indent_style = tab
+
+[*.java]
+indent_size = 2
+indent_style = space
+
+[*.{js,jsx,json,jsonc,json5,ts,tsx}]
+indent_size = 2
+indent_style = space
+
+[*.{md,mdx,mkdn,mdown,markdown}]
+indent_size = unset
+indent_style = space
+
+[*.py]
+indent_size = 4
+indent_style = space
+
+[*.svg]
+indent_size = 2
+indent_style = space
+
+[*.{yaml,yml}]
+indent_size = 2
+indent_style = space

.github/workflows/check-general-formatting.yml

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+name: Check General Formatting
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+  pull_request:
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to tools.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Check formatting
+        uses: editorconfig-checker/action-editorconfig-checker@v1.0.0

.github/workflows/check-license.yml

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+name: Check License
+
+env:
+  EXPECTED_LICENSE_FILENAME: LICENSE.txt
+  # SPDX identifier: https://spdx.org/licenses/
+  EXPECTED_LICENSE_TYPE: CC0-1.0
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-license.yml"
+      # See: https://github.com/licensee/licensee/blob/master/docs/what-we-look-at.md#detecting-the-license-file
+      - "[cC][oO][pP][yY][iI][nN][gG]*"
+      - "[cC][oO][pP][yY][rR][iI][gG][hH][tH]*"
+      - "[lL][iI][cC][eE][nN][cCsS][eE]*"
+      - "[oO][fF][lL]*"
+      - "[pP][aA][tT][eE][nN][tT][sS]*"
+  pull_request:
+    paths:
+      - ".github/workflows/check-license.yml"
+      - "[cC][oO][pP][yY][iI][nN][gG]*"
+      - "[cC][oO][pP][yY][rR][iI][gG][hH][tH]*"
+      - "[lL][iI][cC][eE][nN][cCsS][eE]*"
+      - "[oO][fF][lL]*"
+      - "[pP][aA][tT][eE][nN][tT][sS]*"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  check-license:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby # Install latest version
+
+      - name: Install licensee
+        run: gem install licensee
+
+      - name: Check license file
+        run: |
+          # See: https://github.com/licensee/licensee
+          LICENSEE_OUTPUT="$(licensee detect --json --confidence=100)"
+
+          DETECTED_LICENSE_FILE="$(echo "$LICENSEE_OUTPUT" | jq .matched_files[0].filename | tr --delete '\r')"
+          echo "Detected license file: $DETECTED_LICENSE_FILE"
+          if [ "$DETECTED_LICENSE_FILE" != "\"$EXPECTED_LICENSE_FILENAME\"" ]; then
+            echo "ERROR: detected license file doesn't match expected: $EXPECTED_LICENSE_FILENAME"
+            exit 1
+          fi
+
+          DETECTED_LICENSE_TYPE="$(echo "$LICENSEE_OUTPUT" | jq .matched_files[0].matched_license | tr --delete '\r')"
+          echo "Detected license type: $DETECTED_LICENSE_TYPE"
+          if [ "$DETECTED_LICENSE_TYPE" != "\"$EXPECTED_LICENSE_TYPE\"" ]; then
+            echo "ERROR: detected license type doesn't match expected $EXPECTED_LICENSE_TYPE"
+            exit 1
+          fi

.github/workflows/check-markdown.yml

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+name: Check Markdown
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-markdown.yml"
+      - ".markdown-link-check.json"
+      - "**/.markdownlint*"
+      - "**.md"
+      - "**.mdx"
+      - "**.mkdn"
+      - "**.mdown"
+      - "**.markdown"
+  pull_request:
+    paths:
+      - ".github/workflows/check-markdown.yml"
+      - ".markdown-link-check.json"
+      - "**/.markdownlint*"
+      - "**.md"
+      - "**.mdx"
+      - "**.mkdn"
+      - "**.mdown"
+      - "**.markdown"
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to markdownlint.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Initialize markdownlint-cli problem matcher
+        uses: xt0rted/markdownlint-problem-matcher@v1
+
+      - name: Install markdownlint-cli
+        run: sudo npm install --global markdownlint-cli
+
+      - name: Run markdownlint
+        run: markdownlint "**/*.md"
+
+  links:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Determine whether only modified files should be checked
+        id: check-modified
+        if: github.event_name == 'pull_request'
+        run: |
+          echo "::set-output name=value::yes"
+
+      - name: Check links
+        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          config-file: .markdown-link-check.json
+          use-quiet-mode: "yes"
+          check-modified-files-only: ${{ steps.check-modified.outputs.value }}
+          base-branch: ${{ github.base_ref }}