[javiergs]

Summary

• Add docs/student-quick-start.md with Java 21, EMOTIV Launcher/Virtual Brainwear, credential setup, first example, and independent Maven project instructions.
• Add docs/examples.md describing five runnable streams, commands, expected observations, licensing caveats, and small student exercises.
• Link the guides from README, remove extra blank lines, clarify credentials, and explain the two complementary CI workflows.
• Configure maven-jar-plugin to exclude cortex4j.properties from JARs, while keeping local resource loading functional for exec:java. Important: local target/classes may still contain credentials; do not distribute build directories.
• Set explicit read-only contents: read permission in the isolated Maven Central dependency workflow.

Validation

• Confirm mvn clean verify passes with Java 21.
• Confirm jar tf target/cortex4j-getting-started-1.0.jar does not list cortex4j.properties when a local credentials file is present.
• If possible, confirm DeviceExample still reads local credentials and connects to Launcher. Live device testing is not performed in CI.

No change to com.javiergs:cortex4j:0.2.0, branch protection, or underlying library source.