Add event trace spring boot starter usage document

docs/content/user-manual/elasticjob-lite/usage/event-trace/spring-boot-starter.cn.md

@@ -1,7 +1,45 @@
 +++
-title = "Spring Boot Starter"
+title = "使用 Spring Boot Starter"
 weight = 2
 chapter = true
 +++
 
-TODO
+ElasticJob-Lite 提供了自动配置 TracingConfiguration 的 Tracing Spring Boot Starter，
+开发者只需注册一个 DataSource 到 Spring 容器中，
+Starter 就会自动创建一个 TracingConfiguration 并注册到 Spring 容器中。
+
+## 引入 elasticjob-tracing-spring-boot-starter
+
+```xml
+<dependency>
+    <groupId>org.apache.shardingsphere.elasticjob</groupId>
+    <artifactId>elasticjob-tracing-spring-boot-starter</artifactId>
+    <version>${elasticjob.latest.version}</version>
+</dependency>
+```
+
+## 借助 spring-boot-starter-jdbc 注册 DataSource
+
+引入依赖：
+```xml
+<dependency>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-jdbc</artifactId>
+    <version>${springboot.version}</version>
+</dependency>
+```
+
+配置 DataSource：
+```yaml
+spring:
+  datasource:
+    url: jdbc:h2:mem:job_event_storage
+    driver-class-name: org.h2.Driver
+    username: sa
+    password:
+```
+
+## 使用
+
+TracingConfiguration 会自动注册到容器中，如果与 elasticjob-lite-spring-boot-starter 配合使用，
+开发者无需进行其他额外的操作，作业启动器会自动使用创建的 TracingConfiguration。

docs/content/user-manual/elasticjob-lite/usage/event-trace/spring-boot-starter.en.md

@@ -1,7 +1,46 @@
 +++
-title = "Spring Boot Starter"
+title = "Use Spring Boot Starter"
 weight = 2
 chapter = true
 +++
 
-TODO
+ElasticJob-Lite provides a Spring Boot Starter to configure TracingConfiguration automatically.
+What developers need to do is register a bean of DataSource into the Spring IoC Container.
+Then the Starter will create an instance of TracingConfiguration and register it into the container.
+
+## Introduce elasticjob-tracing-spring-boot-starter dependency
+
+```xml
+<dependency>
+    <groupId>org.apache.shardingsphere.elasticjob</groupId>
+    <artifactId>elasticjob-tracing-spring-boot-starter</artifactId>
+    <version>${elasticjob.latest.version}</version>
+</dependency>
+```
+
+## Register DataSource via spring-boot-starter-jdbc
+
+Introduce dependency:
+```xml
+<dependency>
+    <groupId>org.springframework.boot</groupId>
+    <artifactId>spring-boot-starter-jdbc</artifactId>
+    <version>${springboot.version}</version>
+</dependency>
+```
+
+Configure DataSource:
+```yaml
+spring:
+  datasource:
+    url: jdbc:h2:mem:job_event_storage
+    driver-class-name: org.h2.Driver
+    username: sa
+    password:
+```
+
+## Usage
+
+TracingConfiguration will be registered into the IoC container imperceptibly.
+If elasticjob-lite-spring-boot-starter was introduced, developers need to do nothing else. 
+The instances of JobBootstrap will use the TracingConfiguration automatically.