Setting Up Maven

If you already have a pom.xml set up you can simply add the following to the <project> block of
your pom.xml to add the SpongeAPI dependency:
<repositories>
    <repository>
        <id>sponge-repo</id>
        <name>Sponge Maven Repository</name>
        <url>https://repo.spongepowered.org/maven</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>org.spongepowered</groupId>
        <artifactId>spongeapi</artifactId>
        <version>7.1.0</version>
        <type>jar</type>
        <scope>provided</scope>
    </dependency>
</dependencies>

If you are instead looking for a more complete example which you can tweak to your needs, you can use the following as your basis:

<?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>

    <!-- Don't forget to change all necessary values to your own! -->
    <groupId>com.example</groupId>
    <artifactId>exampleid</artifactId>

    <name>ExamplePluginName</name>
    <version>1.0.0</version>

    <url>http://example.com/</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <packaging>jar</packaging>

    <repositories>
        <repository>
            <id>sponge-repo</id>
            <url>https://repo.spongepowered.org/maven</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.spongepowered</groupId>
            <artifactId>spongeapi</artifactId>
            <version>7.1.0</version>
            <type>jar</type>
            <optional>true</optional>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>ExamplePluginName</finalName>
        <defaultGoal>clean install</defaultGoal>
        <resources>
            <resource>
                <targetPath>.</targetPath>
                <directory>${basedir}/</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-clean-plugin</artifactId>
                <version>3.1.0</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <version>3.0.2</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.7.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>