Create README.md

Author: jasongao97

README.md

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+# fetch-notion
+
+Github action that imports `nature-of-code` content on Notion as static HTMLs.
+
+## Inputs
+
+### `notion-secret`
+
+**Required** The access secret for notion.
+
+### `notion-database-id`
+
+**Required** The `id` of the content database.
+
+### `output-folder`
+
+The output folder for HTMLs. Default `content/`.
+
+## Example usage
+
+```yaml
+uses: nature-of-code/fetch-notion@main
+with:
+  notion-secret: ${{ secrets.NOTION_SECRET }}
+  notion-database-id: ${{ secrets.NOTION_DATABASE_ID }}
+```