Add doc examples

plugin/hello-world/src/main/java/org/opencds/cqf/ruler/plugin/hello/HelloWorldProvider.java

@@ -4,16 +4,32 @@
 import org.opencds.cqf.ruler.api.OperationProvider;
 import org.springframework.beans.factory.annotation.Autowired;
 
+import ca.uhn.fhir.model.api.annotation.Description;
 import ca.uhn.fhir.rest.annotation.Operation;
 
+/**
+ * This is an example OperationProvider that returns a simple greeting. This is meant to be a demonstration of how to implement an OperationProvider,
+ * and not an actual implementation of anything. It also shows hows to use the  <a href="#{@link}">{@link Description}</a> and  <a href="#{@link}">{@link Operation}</a>
+ * annotations.
+ * <p>
+ * When implementing the operations it's important to capture the specific IG the operation is defined in. Additional, release versions should be used whenever possible.
+ * Please add both the appropriate Javadoc comments so that implementors have documentation when writing Java code, and also use the <a href="#{@link}">{@link Description}</a>
+ * annotation so that the relevant information is surfaced via the Tester UI and Swagger UI.
+ */
 public class HelloWorldProvider implements OperationProvider {
 
     @Autowired
     HelloWorldProperties helloWorldProperties;
 
 
+    /**
+     * Implements the $hello-world operation found in the <a href="https://www.hl7.org/fhir/clinicalreasoning-module.html">FHIR CR Module</a>
+     * 
+     * @return a greeting
+     */
+    @Description(shortDefinition = "returns a greeting", value = "Implements the $hello-world operation found in the <a href=\"https://www.hl7.org/fhir/clinicalreasoning-module.html\">FHIR CR Module</a>")
     @Operation(idempotent=true, name = "$hello-world")
-    public OperationOutcome message() {
+    public OperationOutcome hello_world() {
         OperationOutcome outcome = new OperationOutcome();
         outcome.addIssue().setDiagnostics(helloWorldProperties.getMessage());
         return outcome;