Add Relay Detail View

Changelog-Added: Relay Detail View
Closes: #479

damus/Util/NIPURLBuilder.swift

@@ -0,0 +1,26 @@
+//
+//  NIPURLBuilder.swift
+//  damus
+//
+//  Created by Honk on 2/1/23.
+//
+
+import Foundation
+
+struct NIPURLBuilder {
+    static private let baseURL = "https://github.com/nostr-protocol/nips/blob/master/"
+    static func url(forNIP nip: Int) -> URL? {
+        let urlString = baseURL + "\(formatNipNumber(nip: nip)).md"
+        return URL(string: urlString)
+    }
+    
+    static func formatNipNumber(nip: Int) -> String {
+        let formatted: String
+        if nip < 10 {
+            formatted = "0\(nip)"
+        } else {
+            formatted = "\(nip)"
+        }
+        return formatted
+    }
+}