Update docs

- Add more repository config samples.
- Relates to #270

spring-statemachine-data/mongodb/src/test/java/org/springframework/statemachine/data/mongodb/docs/DocsMongoDbRepositorySampleTests1.java

@@ -48,4 +48,39 @@ public class DocsMongoDbRepositorySampleTests1 {
 		}
 // end::snippetA[]
 	}
+
+	public static class Config2 {
+// tag::snippetB[]
+		@Autowired
+		StateRepository<MongoDbRepositoryState> stateRepository;
+
+		@Autowired
+		TransitionRepository<MongoDbRepositoryTransition> transitionRepository;
+
+		void addConfig() {
+			MongoDbRepositoryState stateS1 = new MongoDbRepositoryState("S1", true);
+			MongoDbRepositoryState stateS2 = new MongoDbRepositoryState("S2");
+			MongoDbRepositoryState stateS3 = new MongoDbRepositoryState("S3");
+
+			MongoDbRepositoryState stateS21 = new MongoDbRepositoryState("S21", true);
+			stateS21.setParentState(stateS2);
+			MongoDbRepositoryState stateS22 = new MongoDbRepositoryState("S22");
+			stateS22.setParentState(stateS2);
+
+			stateRepository.save(stateS1);
+			stateRepository.save(stateS2);
+			stateRepository.save(stateS3);
+			stateRepository.save(stateS21);
+			stateRepository.save(stateS22);
+
+			MongoDbRepositoryTransition transitionS1ToS2 = new MongoDbRepositoryTransition(stateS1, stateS2, "E1");
+			MongoDbRepositoryTransition transitionS2ToS3 = new MongoDbRepositoryTransition(stateS21, stateS22, "E2");
+			MongoDbRepositoryTransition transitionS21ToS22 = new MongoDbRepositoryTransition(stateS2, stateS3, "E3");
+
+			transitionRepository.save(transitionS1ToS2);
+			transitionRepository.save(transitionS2ToS3);
+			transitionRepository.save(transitionS21ToS22);
+		}
+// end::snippetB[]
+	}
 }