How to Add the package within SPM as dependency

[ishayan18]

I am adding Reachability as a dependency in my Swift package. There is no documentation of how would I do that? There is this error unknown package 'Reachability' in dependencies of target 'ABC'

My swift.package manifest code

.package(url: "https://github.com/ashleymills/Reachability.swift.git", from: "5.1.0"),
.product(name: "Reachability", package: "Reachability"),