Add IsReadyInfo model

Sources/XXClient/Models/IsReadyInfo.swift

+import Foundation
+
+public struct IsReadyInfo: Equatable {
+  public init(isReady: Bool, howClose: Double) {
+    self.isReady = isReady
+    self.howClose = howClose
+  }
+
+  public var isReady: Bool
+  public var howClose: Double
+}
+
+extension IsReadyInfo: Codable {
+  enum CodingKeys: String, CodingKey {
+    case isReady = "IsReady"
+    case howClose = "HowClose"
+  }
+
+  public static func decode(_ data: Data) throws -> Self {
+    try JSONDecoder().decode(Self.self, from: data)
+  }
+
+  public func encode() throws -> Data {
+    try JSONEncoder().encode(self)
+  }
+}

Tests/XXClientTests/Models/IsReadyInfoTests.swift

+import CustomDump
+import XCTest
+@testable import XXClient
+
+final class IsReadyInfoTests: XCTestCase {
+  func testCoding() throws {
+    let jsonString = """
+    {
+      "IsReady": true,
+      "HowClose": 0.534
+    }
+    """
+    let jsonData = jsonString.data(using: .utf8)!
+    let model = try IsReadyInfo.decode(jsonData)
+
+    XCTAssertNoDifference(model, IsReadyInfo(
+      isReady: true,
+      howClose: 0.534
+    ))
+
+    let encodedModel = try model.encode()
+    let decodedModel = try IsReadyInfo.decode(encodedModel)
+
+    XCTAssertNoDifference(decodedModel, model)
+  }
+}