Add installation guide for SPM
Add installation guide for SPM
ycfreeman/ReSwift,mpsnp/ReSwift,Swift-Flow/Swift-Flow,Swift-Flow/Swift-Flow,mpsnp/ReSwift,ReSwift/ReactiveReSwift,Swift-Flow/Swift-Flow,ReSwift/ReactiveReSwift,ycfreeman/ReSwift,ReSwift/ReactiveReSwift,Swift-Flow/Swift-Flow,mpsnp/ReSwift,ycfreeman/ReSwift,ReSwift/ReSwift,ycfreeman/ReSwift,ReSwift/ReSwift,ycfreeman/ReSwift,ReSwift/ReSwift,Swift-Flow/Swift-Flow