doc(docs.topics.jvm.getStartedSpringBoot): add notes and examples

docs/topics/jvm/spring/getStartedSpringBoot/.gitignore

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+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Kotlin ###
+.kotlin

docs/topics/jvm/spring/getStartedSpringBoot/README.md

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+## How has it been created?
+* Following ALL "*.md" here
+
+## How to run it locally?
+* via IDE
+  * click the green **Run** icon in the gutter and select **Run 'MainKt'**
+* via CL
+  * `./gradlew bootRun`
+
+## Sample requests
+* http://localhost:8080?name=John

docs/topics/jvm/spring/getStartedSpringBoot/build.gradle.kts

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+plugins {
+	kotlin("jvm") version "1.9.25"	// kotlin version / use | project
+	kotlin("plugin.spring") version "1.9.25" // Kotlin Spring compiler
+	// -- ad `open` | Kotlin classes -- Reason: make them -- compatible with -- Spring Framework features--
+
+	id("org.springframework.boot") version "3.3.3"
+	id("io.spring.dependency-management") version "1.1.6"
+}
+
+group = "com.example"
+version = "0.0.1-SNAPSHOT"
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(17)
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation("org.springframework.boot:spring-boot-starter-data-jdbc")
+	implementation("org.springframework.boot:spring-boot-starter-web")
+	implementation("com.fasterxml.jackson.module:jackson-module-kotlin") // serialize & deserialize Kotlin classes & data classes
+	implementation("org.jetbrains.kotlin:kotlin-reflect")
+	runtimeOnly("com.h2database:h2")
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+	testImplementation("org.jetbrains.kotlin:kotlin-test-junit5")
+	testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+kotlin {
+	compilerOptions {
+		freeCompilerArgs.addAll("-Xjsr305=strict")
+		// add extra arguments -- to the -- compiler
+	}
+}
+
+tasks.withType<Test> {
+	useJUnitPlatform()
+}

docs/topics/jvm/spring/getStartedSpringBoot/gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists