Add spellcheck CI job

.github/workflows/spellcheck.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v4
+
+      - name: GitHub Spellcheck
+        uses: igsekor/[email protected]
+

ru-custom.txt

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+FreeBSD
+KDE
+freebsd
+https
+ru

spellcheck.yml

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+matrix:
+- name: Readme
+  sources:
+  - README.md
+  hunspell:
+    lang: ru
+    d: ru_RU
+
+  dictionary:
+    wordlists:
+    - ru-custom.txt