Update Installation Steps in README.md

[abhimanyu95]

Previously

2.Add this to the root/project build.gradle file:
allprojects {
  repositories {
    google()
    jcenter()

    maven {
        url = 'https://libs.dev.cred.club/'
    }
  }
}

After Latest Update of Android Studio Arctic Fox
Now they had moved this block to settings.gradle file

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven {
            url = 'https://libs.dev.cred.club/'
        }
    }
}