Add getdescriptorinfo method

Author: fanquake

Sources/CoreRPC/Descriptor.swift

@@ -0,0 +1,17 @@
+import Foundation
+import PromiseKit
+
+public extension CoreRPC {
+
+    struct DescriptorInfo: Codable {
+        let descriptor: String
+        let isrange: Bool
+        let issolvable: Bool
+        let hasprivatekeys: Bool
+    }
+
+    func getDescriptorInfo(_ descriptor: String) -> Promise<DescriptorInfo> {
+        return call(method: .getdescriptorinfo, params: [descriptor])
+    }
+
+}

Sources/CoreRPC/Methods.swift

@@ -18,6 +18,7 @@ public enum RPCMethod: String, Codable {
     case getchaintips = "getchaintips"
     case getchaintxstats = "getchaintxstats"
     case getconnectioncount = "getconnectioncount"
+    case getdescriptorinfo = "getdescriptorinfo"
     case getdifficulty = "getdifficulty"
     case getmemoryinfo = "getmemoryinfo"
     case getmempoolinfo = "getmempoolinfo"