Refactor in one unique command with subcommand + add a new command to generate ressources from a configuration file

Sources/ResgenSwift/Generate/Parser/ConfigurationFileParser.swift

@@ -0,0 +1,27 @@
+//
+//  ConfigurationFileParser.swift
+//  
+//
+//  Created by Thibaut Schmitt on 30/08/2022.
+//
+
+import Foundation
+import Yams
+
+class ConfigurationFileParser {
+    static func parse(_ configurationFile: String) -> ConfigurationFile {
+        guard let data = FileManager().contents(atPath: configurationFile) else {
+            let error = GenerateError.fileNotExists(configurationFile)
+            print(error.localizedDescription)
+            Generate.exit(withError: error)
+        }
+        
+        guard let configuration = try? YAMLDecoder().decode(ConfigurationFile.self, from: data) else {
+            let error = GenerateError.invalidConfigurationFile(configurationFile)
+            print(error.localizedDescription)
+            Generate.exit(withError: error)
+        }
+        
+        return configuration
+    }
+}