Add a Spring Boot example and integration code.

Change-Id: Ia11dea607c74d9b4cc9a698e9ec92e930bd03f37
diff --git a/examples/spring-boot/pom.xml b/examples/spring-boot/pom.xml
new file mode 100644
index 0000000..29e17d3
--- /dev/null
+++ b/examples/spring-boot/pom.xml
@@ -0,0 +1,93 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"
+  xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>eu.mulk.quarkus-googlecloud-jsonlogging</groupId>
+    <artifactId>quarkus-googlecloud-jsonlogging-parent</artifactId>
+    <version>3.1.4-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>quarkus-googlecloud-jsonlogging-spring-boot-example</artifactId>
+  <name>Quarkus Google Cloud JSON Logging Extension - Spring Boot Example</name>
+
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-dependencies</artifactId>
+        <version>2.6.2</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.jboss.slf4j</groupId>
+      <artifactId>slf4j-jboss-logmanager</artifactId>
+      <version>1.1.0.Final</version>
+    </dependency>
+    <!-- *** optional ***
+    <dependency>
+      <groupId>org.jboss.logmanager</groupId>
+      <artifactId>log4j2-jboss-logmanager</artifactId>
+      <version>1.0.0.Final</version>
+    </dependency>
+    -->
+    <!-- *** optional ***
+    <dependency>
+      <groupId>org.jboss.logmanager</groupId>
+      <artifactId>log4j-jboss-logmanager</artifactId>
+      <version>1.2.2.Final</version>
+    </dependency>
+    -->
+    <!-- *** optional ***
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>jcl-over-slf4j</artifactId>
+    </dependency>
+    -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-web</artifactId>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter</artifactId>
+      <exclusions>
+        <exclusion>
+          <groupId>ch.qos.logback</groupId>
+          <artifactId>logback-classic</artifactId>
+        </exclusion>
+        <!--
+        <exclusion>
+          <groupId>org.springframework.boot</groupId>
+          <artifactId>spring-boot-starter-logging</artifactId>
+        </exclusion>
+        -->
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>eu.mulk.quarkus-googlecloud-jsonlogging</groupId>
+      <artifactId>quarkus-googlecloud-jsonlogging-core</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-maven-plugin</artifactId>
+        <version>2.6.2</version>
+      </plugin>
+    </plugins>
+  </build>
+
+</project>