Add lightweight model JAR size highlight to README

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

README.md

@@ -343,6 +343,17 @@ The default value is **TRUE** for all of the above properties.
 
 The xAPI model can be used by clients that send xAPI data or by servers that receive xAPI data.
 
+### Lightweight and Efficient
+
+**The xAPI Model JAR is remarkably lightweight at just ~120 KB (122,692 bytes).** This compact size makes it ideal for:
+
+- Resource-constrained environments
+- Microservices architectures
+- Mobile and embedded applications
+- Applications with strict dependency size requirements
+
+The model JAR is available for direct download from the [Maven Central Repository](https://repo.maven.apache.org/maven2/dev/learning/xapi/xapi-model/1.1.11/xapi-model-1.1.11.jar).
+
 ### Getting started
 
 To use the xAPI Model include the appropriate XML in the `dependencies` section of your `pom.xml`, as shown in the following example: