chore: add spellcheck to CI

.github/workflows/spellcheck.yml

@@ -0,0 +1,15 @@
+name: Spellcheck
+
+on:
+ push:
+   branches: [master]
+ pull_request:
+
+jobs:
+  build:
+    name: Spellcheck
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: rojopolis/[email protected]
+      name: Spellcheck

.spellcheck.yml

@@ -0,0 +1,18 @@
+matrix:
+- name: Markdown
+  aspell:
+    lang: en
+  dictionary:
+    wordlists:
+    - .wordlist.txt
+    encoding: utf-8
+  pipeline:
+  - pyspelling.filters.markdown:
+  - pyspelling.filters.html:
+    comments: false
+    ignores:
+    - code
+    - pre
+  sources:
+  - '**/*.md'
+  default_encoding: utf-8