[1.7.2] build.gradle file with Side Mods

Hello, was curious how I would go about adding side mods into the build file for gradle. Currently have the following for the main mod:

buildscript {
    repositories {
        mavenCentral()
        maven {
            name = "forge"
            url = "http://files.minecraftforge.net/maven"
        }
        maven {
            name = "sonatype"
            url = "https://oss.sonatype.org/content/repositories/snapshots/"
        }
    }
    dependencies {
        classpath 'net.minecraftforge.gradle:ForgeGradle:1.2-SNAPSHOT'
    }
}

apply plugin: 'forge'

repositories {
    flatDir {
        name "fileRepo"
        dirs "repo"
    }
}

version = "3.2"
group= "com.pixelmonmod" // http://maven.apache.org/guides/mini/guide-naming-conventions.html
archivesBaseName = "Pixelmon"

minecraft {
    version = "1.7.2-10.12.1.1060"
}

processResources
{

    // replace stuff in mcmod.info, nothing else
    from(sourceSets.main.resources.srcDirs) {
        include 'mcmod.info'
                
        // replace version and mcversion
        expand 'version':project.version, 'mcversion':project.minecraft.version
    }
        
    // copy everything else, thats not the mcmod.info
    from(sourceSets.main.resources.srcDirs) {
        exclude 'mcmod.info'
    }
    
    // generate version.properties file from the git version data earlier
    doLast {
      def propsFile = new File(destinationDir, 'version.properties')
      def properties = new Properties()
      properties['Pixelmon.build.mcversion'] = project.minecraft.version
      properties.store(propsFile.newWriter(), null)
    }
}

// this sets our output jar to have a 'tag' of 'universal' on it
// It also adds the minecraft version in a custom version name
// The result is files named <projectname>-<mcversion>-<version>-universal.jar
jar {
    classifier = 'universal'
    version = "${project.minecraft.version}-${project.version}"

}

task sourceJar(type: Jar) {
from sourceSets.main.allSource
classifier = 'src'
    version = "${project.minecraft.version}-${project.version}"
}

// Add in an mcp named jar, for those who wish to run in a development environment (assuming mcp naming matches)
task deobfJar(type: Jar) {
from sourceSets.main.output
classifier = 'deobf'
    version = "${project.minecraft.version}-${project.version}"
}