Added missing public initialisers in the Credentials and File parameters.

Libraries/Sources/APIService/Protocols/Service.swift

@@ -20,11 +20,33 @@ public protocol Service {
 // MARK: - Structs
 
 public struct Credentials {
+    
+    // MARK: Properties
+    
     let username: String
     let password: String
+    
+    // MARK: Initialisers
+    
+    public init(username: String, password: String) {
+        self.username = username
+        self.password = password
+    }
+    
 }
 
 public struct File {
+    
+    // MARK: Properties
+    
     let name: String
     let data: Data
+    
+    // MARK: Initialisers
+    
+    public init(name: String, data: Data) {
+        self.name = name
+        self.data = data
+    }
+
 }