docs(pdf): update demo and add sample JSON (#20)

Author: NeurArk

README.md

@@ -38,11 +38,14 @@ docker run -p 7860:7860 neurark/mcp-data-assistant
 # open http://localhost:7860
 ```
 
-▶ **Demo** — open [`sample_docs/report-demo.pdf`](sample_docs/report-demo.pdf)
+▶ **Demo** — open [`sample_docs/report-demo-new.pdf`](sample_docs/report-demo-new.pdf)
 
 ### Advanced PDF reports
-The PDF tool now supports a cover page with optional logo and summary box as
-well as styled charts. A minimal example:
+The PDF tool now supports additional fields:
+* `cover` – adds a logo to the first page
+* `summary` – short text displayed under the title
+* `chart_spec` – customize chart color and size
+A minimal example:
 
 ```json
 {
@@ -60,6 +63,7 @@ well as styled charts. A minimal example:
 }
 ```
 Run `create_pdf` with this JSON to produce a multi-page report with a styled chart.
+The data used for this demo is available at [`sample_docs/report-demo.json`](sample_docs/report-demo.json).
 
 ## How it works
 The app launches Gradio with `mcp_server=True`.  

sample_docs/report-demo-new.pdf

@@ -0,0 +1,14 @@
+{
+  "title": "Demo Sales Report",
+  "summary": "Results for Q1-Q2 2024",
+  "cover": {"logo_path": "assets/logo.png"},
+  "insights": ["Sales up 15% year over year"],
+  "sections": [
+    {"title": "Intro", "type": "paragraph", "text": "This report shows the new layout."},
+    {
+      "title": "Revenue",
+      "type": "chart",
+      "chart_spec": {"chart_type": "bar", "labels": ["Q1", "Q2"], "values": [10, 15], "color": "#ff8800"}
+    }
+  ]
+}