feat: add Notion block types reference documentation

- Introduced a new markdown file detailing various Notion block types for API usage, including examples for creating and reading blocks.
- Covered block types such as paragraphs, headings, lists, to-dos, quotes, callouts, code, toggles, dividers, bookmarks, images, and more.
- Provided structured JSON examples for each block type to assist developers in implementation.

skills/productivity/notion/references/block-types.md

@@ -0,0 +1,108 @@
+# Notion Block Types
+
+Reference for creating and reading all common Notion block types via the API.
+
+## Creating blocks
+
+Use `PATCH /v1/blocks/{page_id}/children` with a `children` array. Each block follows this structure:
+
+```json
+{"object": "block", "type": "<type>", "<type>": { ... }}
+```
+
+### Paragraph
+
+```json
+{"type": "paragraph", "paragraph": {"rich_text": [{"text": {"content": "Hello world"}}]}}
+```
+
+### Headings
+
+```json
+{"type": "heading_1", "heading_1": {"rich_text": [{"text": {"content": "Title"}}]}}
+{"type": "heading_2", "heading_2": {"rich_text": [{"text": {"content": "Section"}}]}}
+{"type": "heading_3", "heading_3": {"rich_text": [{"text": {"content": "Subsection"}}]}}
+```
+
+### Bulleted list
+
+```json
+{"type": "bulleted_list_item", "bulleted_list_item": {"rich_text": [{"text": {"content": "Item"}}]}}
+```
+
+### Numbered list
+
+```json
+{"type": "numbered_list_item", "numbered_list_item": {"rich_text": [{"text": {"content": "Step 1"}}]}}
+```
+
+### To-do / checkbox
+
+```json
+{"type": "to_do", "to_do": {"rich_text": [{"text": {"content": "Task"}}], "checked": false}}
+```
+
+### Quote
+
+```json
+{"type": "quote", "quote": {"rich_text": [{"text": {"content": "Something wise"}}]}}
+```
+
+### Callout
+
+```json
+{"type": "callout", "callout": {"rich_text": [{"text": {"content": "Important note"}}], "icon": {"emoji": "💡"}}}
+```
+
+### Code
+
+```json
+{"type": "code", "code": {"rich_text": [{"text": {"content": "print('hello')"}}], "language": "python"}}
+```
+
+### Toggle
+
+```json
+{"type": "toggle", "toggle": {"rich_text": [{"text": {"content": "Click to expand"}}]}}
+```
+
+### Divider
+
+```json
+{"type": "divider", "divider": {}}
+```
+
+### Bookmark
+
+```json
+{"type": "bookmark", "bookmark": {"url": "https://example.com"}}
+```
+
+### Image (external URL)
+
+```json
+{"type": "image", "image": {"type": "external", "external": {"url": "https://example.com/photo.png"}}}
+```
+
+## Reading blocks
+
+When reading blocks from `GET /v1/blocks/{page_id}/children`, each block has a `type` field. Extract readable text like this:
+
+| Type | Text location | Extra fields |
+|------|--------------|--------------|
+| `paragraph` | `.paragraph.rich_text` | — |
+| `heading_1/2/3` | `.heading_N.rich_text` | — |
+| `bulleted_list_item` | `.bulleted_list_item.rich_text` | — |
+| `numbered_list_item` | `.numbered_list_item.rich_text` | — |
+| `to_do` | `.to_do.rich_text` | `.to_do.checked` (bool) |
+| `toggle` | `.toggle.rich_text` | has children |
+| `code` | `.code.rich_text` | `.code.language` |
+| `quote` | `.quote.rich_text` | — |
+| `callout` | `.callout.rich_text` | `.callout.icon.emoji` |
+| `divider` | — | — |
+| `image` | `.image.caption` | `.image.file.url` or `.image.external.url` |
+| `bookmark` | `.bookmark.caption` | `.bookmark.url` |
+| `child_page` | — | `.child_page.title` |
+| `child_database` | — | `.child_database.title` |
+
+Rich text arrays contain objects with `.plain_text` — concatenate them for readable output.