feat:adding block library set up app

tools/library-setup/README.md

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+# Library Setup Tool
+
+Generate block documentation for your DA.live library from GitHub repositories.
+
+## Setup Mode
+
+![Library Setup Mode](./images/setup-mode.png)
+
+Use this mode to create a new block library from scratch:
+
+- Enter your GitHub repository URL to discover blocks
+- Private repositories supported - enter a GitHub token when prompted
+- Select which blocks to include in your library
+- Blocks are automatically analyzed for structure, variants, and features
+- Placeholder documentation generated based on block code analysis
+- Optionally select sample pages to extract real content examples
+- Creates library structure in DA.live with blocks.json configuration
+- Updates site configuration to register the library
+
+## Refresh Documentation Mode
+
+![Refresh Documentation Mode](./images/refresh-mode.png)
+
+Use this mode to update existing block documentation with new content:
+
+- No GitHub repository required - reads from existing library
+- Enter your DA.live organization and site name
+- Select which blocks to update
+- Add new sample pages to extract fresh content examples
+- Only updates blocks found in the selected pages
+- Preserves existing blocks not being updated
+- Maintains all library configuration settings
+
+## Requirements
+
+- Must be run from within DA.live for authentication
+- GitHub token needed only for private repositories (can be saved for future use)
+- Sample pages optional - tool generates intelligent placeholders without them