Access project's src/main/resources from tasks in a custom plugin

I am writing a custom plugin to assist in tests and a few other things. The custom plugin has a number of tasks. A few of the tasks need to access the main project’s /src/main/resources folder.

What is the best way to do this?
plugin code :
class CustomPlugin implements Plugin {

void apply(Project project) {

    project.afterEvaluate {
        Task customTask = project.tasks.create("startDatabase", StartDatabaseTask)
        customTask.setProperty("portNumber", randomPort)
        // i need to read the project  /src/main/resources from inside the custom task. 

Would be grateful if someone can point out the best way to do this.