Update 58.1. Including the plugin.md

VIII. Build tool plugins/58.1. Including the plugin.md

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+### 58.1. 包含该插件
+
+想要使用Spring Boot Maven插件只需简单地在你的pom.xml的`plugins`部分包含相应的XML：
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <!-- ... -->
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>1.3.0.BUILD-SNAPSHOT</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
+```
+该配置会在Maven生命周期的`package`阶段重新打包一个jar或war。下面的示例显示在`target`目录下既有重新打包后的jar，也有原始的jar：
+```shell
+$ mvn package
+$ ls target/*.jar
+target/myproject-1.0.0.jar target/myproject-1.0.0.jar.original
+```
+如果不包含像上面那样的`<execution/>`，你可以自己运行该插件（但只有在package目标也被使用的情况）。例如：
+```shell
+$ mvn package spring-boot:repackage
+$ ls target/*.jar
+target/myproject-1.0.0.jar target/myproject-1.0.0.jar.original
+```
+如果使用一个里程碑或快照版本，你还需要添加正确的pluginRepository元素：
+```xml
+<pluginRepositories>
+    <pluginRepository>
+        <id>spring-snapshots</id>
+        <url>http://repo.spring.io/snapshot</url>
+    </pluginRepository>
+    <pluginRepository>
+        <id>spring-milestones</id>
+        <url>http://repo.spring.io/milestone</url>
+    </pluginRepository>
+</pluginRepositories>
+```