plugin.yml

name: ${project.name}
version: ${project.version}
#Might need to change this depending on your package structure, but it's standard not to.
main: ${project.groupId}.${project.artifactId}

pom.xml

<!--Tell maven that we want to add to the repositories it will look in when it tries to find jar files for us-->
<repositories>
	<!--This is the respository that stores the spigot API jar files online-->
	<repository>
		<id>spigot-repo</id>
		<url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
	</repository>
</repositories>

<!--Tell maven the id and version of each dependancy our project needs so it can download it from a repository-->
<dependencies>
	<!--Tell maven to add a version of spigot to our project-->
	<dependency>
		<groupId>org.spigotmc</groupId>
		<artifactId>spigot-api</artifactId>
		<version>1.12.2-R0.1-SNAPSHOT</version>
		<!--Tell maven not to include a copy of the spigot API in your plugin as it's already in the server's jar-->
		<scope>provided</scope>
	</dependency>
</dependencies>

<!--Tell maven to compile our project using java 8-->
<properties>
	<maven.compiler.source>1.8</maven.compiler.source>
	<maven.compiler.target>1.8</maven.compiler.target>
</properties>

<!--Tell maven how to prepare and build our jar file from our source and dependancies-->
<build>
	<!--Tell maven what plugins we want to add and what they should do-->
	<plugins>
		<!--Tell maven the id and version of the 'shade' plugin's jar file so it can download it from a repository-->
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-shade-plugin</artifactId>
			<version>3.1.0</version>
			<executions>
				<!--Tell the shade plugin when it should be run during a maven build-->
				<execution>
					<!--Tell the shade plugin to run once during the 'package' phase of a maven build-->
					<phase>package</phase>
					<!--Tell the shade plugin which of it's goals to attempt to run during this phase-->
					<goals>
						<goal>shade</goal>
					</goals>
					<!--Tell the shade plugin which of it's goals to attempt to run during this phase-->
					<configuration>
						<!--Tell the shade plugin where to put our jar file-->
						<outputFile>${project.basedir}/Server/plugins/${project.artifactId}.jar</outputFile>
						<minimizeJar>true</minimizeJar>
					</configuration>
				</execution>
			</executions>
		</plugin>
	</plugins>
	
	<!--Tell maven to enable resource filtering so we can use macros like '${project.version}' inside of our plugin.yml-->
	<resources>
		<resource>
			<directory>src/main/resources</directory>
			<filtering>true</filtering>
		</resource>
	</resources>
</build>