update README

README.md

@@ -37,6 +37,8 @@ Synthea is an open-source synthetic patient dataset that simulates health record
 
 Source: https://synthea.mitre.org/
 
+Size: 145514 nodes, 311701 edges
+
 ```python
 print(datasets.dataset_info("SYNTHEA_P100")
 
@@ -49,6 +51,8 @@ This dataset contains information on Common Vulnerabilities and Exposures (CVE),
 
 Source: https://www.kaggle.com/datasets/andrewkronser/cve-common-vulnerabilities-and-exposures
 
+Size: 145506 nodes, 316967 edges
+
 ```python
 print(datasets.dataset_info("CVE")
 
@@ -61,6 +65,8 @@ The Flights dataset in the ArangoDB Example Datasets contains flight-related dat
 
 Source: https://github.com/arangodb/example-datasets/tree/master/Data%20Loader
 
+Size: 3375 nodes, 286463 edges
+
 ```python
 print(datasets.dataset_info("FLIGHTS")
 
@@ -73,6 +79,8 @@ The GDELT Project (Global Database of Events, Language, and Tone) is an open dat
 
 Source: https://www.gdeltproject.org/
 
+Size: 80047 nodes, 321819 edges
+
 ```python
 print(datasets.dataset_info("OPEN_INTELLIGENCE")