Add GitHub Workflow for checking the spelling of Markdown content.

.github/dictionary.txt

@@ -0,0 +1,107 @@
+addin
+APIs
+async
+atx
+ATX
+atx-style
+axibase
+backtick
+backticks
+blockquote
+blockquotes
+Boostnote
+br
+br_spaces
+changelogs
+CLI
+coc-markdownlint
+CodeQL
+CodiMD
+CommonMark
+config
+Config
+config.
+CVE-2022-21670
+docs-util
+ES2015
+ES6
+ESLint
+eslint-plugin-markdownlint
+first-header-h1
+first-heading-h1
+first-line-h1
+formatter
+fs
+globbing
+grunt-markdownlint
+h1
+h2
+html_elements
+JSDoc
+JSON
+JSONC
+kramdown
+linter
+Lombiq
+markdownlint
+markdownlint-cli
+markdownlint-cli2
+markdownlint-rule-helpers
+matcher
+MD\d\d\d
+MD\d\d\d-MD\d\d\d
+mdl
+MDN
+minified
+MkDocs
+MSBuild
+namespace
+Neovim
+no-bare-urls
+no-blanks-blockquote
+no-inline-html
+no-missing-space-atx
+no-missing-space-closed-atx
+no-multiple-space-atx
+no-multiple-space-blockquote
+no-multiple-space-closed-atx
+non-JSON
+npm
+ol
+ol_multi
+ol-prefix
+pandoc
+Params
+parsers
+pre-commit
+Reactable
+README
+reimplement
+setext
+setext_with_atx
+setext_with_atx_closed
+single-h1
+sublist
+Super-Linter
+TestCafe
+TOML
+trimLeft
+trimRight
+ul
+ul_single
+ul-indent
+ul-start-left
+ul-style
+unhandled
+unreferenced
+url
+v12
+V8
+vscode-docs-authoring
+vscode-markdownlint
+W3C
+webhint
+webhintio
+webpack
+whitespace
+YAML

.github/workflows/spell-check.yml

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+name: SpellCheck
+
+on:
+  pull_request:
+  push:
+  schedule:
+  - cron: '30 12 * * *'
+  workflow_dispatch:
+
+jobs:
+  spellcheck:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: tbroadley/spellchecker-cli-action@v1.1.1
+      with:
+        dictionaries: '.github/dictionary.txt'
+        files: '*.md doc/*.md helpers/*.md'