Add CI/CD configuration and API documentation

iOS-SwiftUI-Code/Library/Network/HTTPClient.swift

@@ -0,0 +1,40 @@
+import Foundation
+import Libbox
+
+public class HTTPClient {
+    private static var userAgent: String {
+        var userAgent = Variant.applicationName
+        userAgent += "/"
+        userAgent += Bundle.main.version
+        userAgent += " (Build "
+        userAgent += Bundle.main.versionNumber
+        userAgent += "; sing-box "
+        userAgent += LibboxVersion()
+        userAgent += ")"
+        return userAgent
+    }
+
+    private let client: any LibboxHTTPClientProtocol
+
+    public init() {
+        client = LibboxNewHTTPClient()!
+        client.modernTLS()
+    }
+
+    public func getString(_ url: String?) throws -> String {
+        let request = client.newRequest()!
+        request.setUserAgent(HTTPClient.userAgent)
+        try request.setURL(url)
+        let response = try request.execute()
+        var error: NSError?
+        let contentString = response.getContentString(&error)
+        if let error {
+            throw error
+        }
+        return contentString
+    }
+
+    deinit {
+        client.close()
+    }
+}