Set up spell-checking action

.github/actions/spell-check/dictionary/README.md

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+# Dictionaries are lists of words to accept unconditionally
+
+While check spelling will complain about a whitelisted word
+which is no longer present, you can include things here even if
+they are not otherwise present in the repository.
+
+E.g., you could include a list of system APIs here, or potential
+contributors (so that if a future commit includes their name,
+it'll be accepted).
+
+### Files
+
+| File | Description |
+| ---- | ----------- |
+| [Dictionary](dictionary.txt) | Primary US English dictionary |
+| [Chinese](chinese.txt) | Chinese words |
+| [Japanese](japanese.txt) | Japanese words |
+| [Microsoft](microsoft.txt) | Microsoft brand items |
+| [Fonts](fonts.txt) | Font names |
+| [Names](names.txt) | Names of people |

.github/actions/spell-check/dictionary/chinese.txt

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+CHINESEBIG
+choseong
+Jongseong
+Jungseong
+ssangtikeut