use config variable

use config variable

def config = rootProject.extensions.getByName("ext") // Create variable to access "ext" members
android {
    compileSdkVersion config["compileSdkVersion"] // access "ext" members using variable "config"
    defaultConfig {
        applicationId "com.pranay.managegradledemo"
        minSdkVersion config["minSdkVersion"]
        targetSdkVersion config["targetSdkVersion"]
        ....
        
    }
    
    ...
 }