Set up spell-checking action

.github/actions/spell-check/excludes.txt

@@ -0,0 +1,19 @@
+\.ai$
+\.bmp$
+\.dat$
+\.dll$
+\.gif$
+\.gitignore$
+\.ico$
+\.jpg$
+\.lcl$
+\.pdf$
+\.png$
+\.PNG$
+\.woff$
+\.zip$
+^\.github/actions/spell-check/
+/package(?:-lock|)\.json$
+/pinyindb/
+/settings-html/
+[/.][a-z]{2}(?:-[a-zA-Z]{2}|)\.

.github/actions/spell-check/patterns.txt

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+https?://(?:(?:www\.|)youtube\.com|youtu.be)/[-a-zA-Z0-9?&=]*
+://github\.(?:com|blog)/[^\w")]+
+://githubusercontent\.com/[^\w")]+
+data:[a-zA-Z=;,/0-9+-]+
+0x[0-9a-fA-F](?:\.[0-9a-fA-F]*|)[pP]
+(?:0[Xx]|U\+|#)[a-f0-9A-FGgRr]{2,}[Uu]?[Ll]{0,2}\b
+[{"][0-9a-fA-F]{8}-(?:[0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}[}"]
+\b([A-Za-z])\1{3,}\b
+(?:L"[abAB]+", ){3}L"[abAB]+"
+"Lorem[^"]+?\."
+TestCase\("[^"]+"
+
+# Windows paths
+\\native
+\\notifications
+\\recyclebin
+\\reinstall
+\\Resize
+\\resource
+\\Resources
+\\restart
+\\restore
+\\result
+\\runner
+\\Telemetry
+\\telemetry
+\\testapp
+\\tests
+\\tools

.github/workflows/spelling.yml

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+name: Spell checking
+on:
+  push:
+  schedule:
+    # * is a special character in YAML so you have to quote this string
+    - cron: '15 * * * *'
+
+jobs:
+  build:
+    name: Spell checking
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2.0.0
+      with:
+        fetch-depth: 5
+    - uses: check-spelling/check-spelling@0.0.16-alpha
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        bucket: .github/actions
+        project: spell-check