added gradle code CI-CD exercise

Author: Jaime Salas Zancada

03-cd/exercises/jenkins-resources/calculator/README.md

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+# calculator
+Java + Gradle repository to learn Jenkins

03-cd/exercises/jenkins-resources/calculator/build.gradle

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+plugins {
+	id 'org.springframework.boot' version '2.3.4.RELEASE'
+	id 'io.spring.dependency-management' version '1.0.10.RELEASE'
+	id 'java'
+}
+
+group = 'com.lemoncode'
+version = '0.0.1-SNAPSHOT'
+sourceCompatibility = '1.8'
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	// implementation 'org.springframework.boot:spring-boot-starter'
+  implementation 'org.springframework.boot:spring-boot-starter-web'
+
+  testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	// testImplementation('org.springframework.boot:spring-boot-starter-test') {
+	// 	exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
+	// }
+}
+
+test {
+	// useJUnitPlatform()
+}

03-cd/exercises/jenkins-resources/calculator/gradle/wrapper/gradle-wrapper.jar

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

03-cd/exercises/jenkins-resources/calculator/gradle/wrapper/gradle-wrapper.properties

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+rootProject.name = 'calculator'

03-cd/exercises/jenkins-resources/calculator/gradlew

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+package com.lemoncode.calculator;
+import org.springframework.stereotype.Service;
+
+@Service
+public class Calculator {
+  int sum(int a, int b) {
+    return a + b;
+  }
+}

03-cd/exercises/jenkins-resources/calculator/gradlew.bat

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+package com.lemoncode.calculator;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CalculatorApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(CalculatorApplication.class, args);
+	}
+
+}

03-cd/exercises/jenkins-resources/calculator/settings.gradle

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+package com.lemoncode.calculator;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+class CalculatorController {
+  @Autowired
+  private Calculator calculator;
+
+  @RequestMapping("/sum")
+  String sum(@RequestParam("a") Integer a,
+             @RequestParam("b") Integer b) {
+               return String.valueOf(calculator.sum(a, b));
+             }
+}