feat(cursor): add cursor rules

.cursor/rules/newsletter.md

@@ -0,0 +1,99 @@
+# Cursor Rules for Newsletter Management
+
+## 1. URL Processing
+When a URL is provided:
+- Remove any tracking/metrics parameters (e.g., ?utm_source=, ?ref=)
+- Keep the base URL clean and readable
+- Preserve the original article title exactly as written
+
+## 2. Newsletter Structure
+### Front Matter (YAML)
+```yaml
+---
+title: "Newsletter #[number]"
+date: [current date]
+tags: [ "AI-Assisted", [additional relevant tags] ]
+categories: [ "Newsletter" ]
+---
+```
+
+### Content Format
+1. Intro text: "*Mời bạn thưởng thức Newsletter #[number].*"
+2. Article sections:
+   ```
+   ## [Original Article Title](clean_url)
+   
+   [Vietnamese summary]
+   
+   [Optional bullet points for key takeaways]
+   ```
+
+## 3. Content Guidelines
+- Summaries must be in Vietnamese
+- Maintain professional tone
+- Include key points in bullet format when appropriate
+- Keep summaries concise but informative
+- Add relevant tags based on article content
+- Always include "AI-Assisted" tag
+
+## 4. File Management
+- Check if there's an open newsletter file
+- If yes: append new content to existing file
+- If no: create new file with proper structure
+- Follow date-based directory structure: content/post/YYYY/MM/DD/index.md
+
+## 5. Quality Checks
+- Ensure proper markdown formatting
+- Verify all links are clean and working
+- Check for consistent Vietnamese language usage
+- Maintain proper spacing between sections
+- Validate YAML front matter structure
+
+## 6. Example Format
+```markdown
+---
+title: "Newsletter #16"
+date: 2025-05-17
+tags: [ "AI-Assisted", "Programming Languages" ]
+categories: [ "Newsletter" ]
+---
+
+*Mời bạn thưởng thức Newsletter \#16.*
+
+## [Article Title](https://clean-url.com)
+
+[Vietnamese summary]
+
+[Optional bullet points]
+```
+
+## 7. Error Prevention
+- Always verify URL is accessible
+- Check for duplicate articles
+- Ensure proper date formatting
+- Validate markdown syntax
+- Maintain consistent formatting across all entries
+
+## 8. Implementation Steps
+1. When a URL is provided:
+   - Clean the URL by removing tracking parameters
+   - Fetch and analyze the content
+   - Create a Vietnamese summary
+   - Identify relevant tags
+
+2. For new newsletters:
+   - Create file in correct directory structure
+   - Add proper front matter
+   - Include intro text
+   - Add article with summary
+
+3. For existing newsletters:
+   - Append new article to existing content
+   - Maintain consistent formatting
+   - Update tags if necessary
+
+4. Final checks:
+   - Verify all formatting
+   - Check Vietnamese language quality
+   - Ensure proper spacing
+   - Validate all links