add Package and Sources

Package.swift

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+import PackageDescription
+
+let package = Package(
+  name: "O2PlayingCard"
+)

README.md

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+# O2PlayingCard

Sources/O2PlayingCard.swift

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+public struct O2PlayingCard {
+  let rank: O2Rank
+  let suit: O2Suit
+}
+
+
+// MARK: - Equatable
+
+extension O2PlayingCard: Equatable {}
+
+public func ==(lhs:O2PlayingCard, rhs: O2PlayingCard) -> Bool {
+  return lhs.rank == rhs.rank && lhs.suit == rhs.suit
+}
+
+// MARK: - Comparable
+extension O2PlayingCard: Comparable {}
+
+public func <(lhs: O2PlayingCard, rhs: O2PlayingCard) -> Bool {
+  return lhs.suit < rhs.suit || (lhs.suit == rhs.suit && lhs.rank < rhs.rank)
+}
+
+// MARK: - CustomStringConvertible
+
+extension O2PlayingCard: CustomStringConvertible {
+  public var description: String {
+    return "\(suit)\(rank)"
+  }
+}

Sources/O2Rank.swift

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+public enum O2Rank: Int {
+  case Ace = 1
+  case Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten
+  case Jack, Queen, King
+}
+
+// MARK: - Comparable
+
+extension O2Rank: Comparable {}
+
+public func <(lhs: O2Rank, rhs: O2Rank) -> Bool {
+  switch (lhs,rhs) {
+  case (_, _) where lhs == rhs:
+    return false
+  case (.Ace, _):
+    return false
+  default:
+    return lhs.rawValue < rhs.rawValue
+  }
+}
+
+// MARK: - CustomStringConvertible
+
+extension O2Rank: CustomStringConvertible {
+  public var description: String {
+    switch self {
+    case .Ace:
+      return "A"
+    case .Jack:
+      return "J"
+    case .Queen:
+      return "Q"
+    case .King:
+      return "K"
+    default:
+      return "\(rawValue)"
+    }
+  }
+}
+

Sources/O2Suit.swift

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+public enum O2Suit: String {
+  case Spades, Hearts, Diamonds, Clubs
+}
+
+// MARK: - Comparable
+
+extension O2Suit: Comparable {}
+
+public func<(lhs: O2Suit, rhs: O2Suit) -> Bool {
+  switch (lhs, rhs) {
+  case (_, _) where lhs == rhs:
+    return false
+  case (.Spades, _), (.Hearts, .Diamonds), (.Hearts, .Clubs), (.Diamonds, .Clubs):
+    return false
+  default:
+    return true
+  }
+}
+
+
+// MARK: - CustomStringConvertible
+extension O2Suit: CustomStringConvertible {
+  public var description: String {
+    switch self {
+    case .Spades:
+      return "♠︎"
+    case .Hearts:
+      return "♡"
+    case .Diamonds:
+      return "♢"
+    case .Clubs:
+      return "♣︎"
+    }
+  }
+}