Add new 'quick-start' module to the Spring Geode Samples.

The new 'quick-start' Spring Geode Sample/module backs the 'Get Started' example Spring Boot, Apache Geode application referenced in the README.

spring-geode-samples/intro/quick-start/src/main/java/example/app/user/UserApplication.java

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+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+package example.app.user;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.data.annotation.Id;
+import org.springframework.data.gemfire.config.annotation.EnableEntityDefinedRegions;
+import org.springframework.data.gemfire.mapping.annotation.Region;
+import org.springframework.data.gemfire.repository.GemfireRepository;
+import org.springframework.geode.config.annotation.EnableClusterAware;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.ToString;
+import lombok.extern.slf4j.Slf4j;
+
+/**
+ * Example {@link SpringBootApplication} using Apache Geode to manage Users.
+ *
+ * @author John Blum
+ * @see org.springframework.boot.ApplicationRunner
+ * @see org.springframework.boot.SpringApplication
+ * @see org.springframework.boot.autoconfigure.SpringBootApplication
+ * @see org.springframework.context.annotation.Bean
+ * @see org.springframework.data.annotation.Id
+ * @see org.springframework.data.repository.CrudRepository
+ * @see org.springframework.data.gemfire.config.annotation.EnableEntityDefinedRegions
+ * @see org.springframework.data.gemfire.mapping.annotation.Region
+ * @see org.springframework.data.gemfire.repository.GemfireRepository
+ * @see org.springframework.geode.config.annotation.EnableClusterAware
+ * @since 1.0.0
+ */
+@Slf4j
+@SpringBootApplication
+@EnableClusterAware
+@EnableEntityDefinedRegions(basePackageClasses = User.class)
+public class UserApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(UserApplication.class, args);
+	}
+
+	@Bean
+	@SuppressWarnings("unused")
+	ApplicationRunner runner(UserRepository userRepository) {
+
+		return args -> {
+
+			long count = userRepository.count();
+
+			assertThat(count).isZero();
+
+			log.info("Number of Users [{}]", count);
+
+			User jonDoe = new User("jonDoe");
+
+			log.info("Created User [{}]", jonDoe);
+
+			userRepository.save(jonDoe);
+
+			log.info("Saved User [{}]", jonDoe);
+
+			count = userRepository.count();
+
+			assertThat(count).isOne();
+
+			log.info("Number of Users [{}]", count);
+
+			User jonDoeFoundById = userRepository.findById(jonDoe.getName()).orElse(null);
+
+			assertThat(jonDoeFoundById).isEqualTo(jonDoe);
+
+			log.info("Found User by ID (name) [{}]", jonDoeFoundById);
+		};
+	}
+}
+
+@Getter
+@ToString
+@EqualsAndHashCode
+@RequiredArgsConstructor
+@Region("Users")
+class User {
+
+	@lombok.NonNull @Id
+	private final String name;
+
+}
+
+//interface UserRepository extends CrudRepository<User, String> { }
+interface UserRepository extends GemfireRepository<User, String> { }