Started init work on source service

lib/models.dart

@@ -0,0 +1,10 @@
+class App {
+  late String id;
+  late String url;
+  String? installedVersion;
+  late String latestVersion;
+  String? readmeHTML;
+  String? base64Icon;
+  App(this.id, this.url, this.installedVersion, this.latestVersion,
+      this.readmeHTML, this.base64Icon);
+}

lib/services/source_service.dart

@@ -0,0 +1,19 @@
+class SourceService {
+  SourceService();
+}
+
+/*
+- Make a function that validates and standardizes github URLs, do the same for gitlab (fail = error)
+- Make a function that gets the App title and Author name from a github URL, do the same for gitlab (can't fail)
+- Make a function that takes a github URL and finds the latest APK release if any (with version), do the same for gitlab (fail = error)
+- Make a function that takes a github URL and returns a README HTML if any, do the same for gitlab (fail = "no description")
+- Make a function that looks for the first image in a README HTML and returns a small base64 encoded version of it (fail = generic icon)
+
+- Make a function that integrates all above and returns an App object for a given github URL, do the same for gitlab
+
+- Make a function that detects the URL (Github or Gitlab) and runs the right function above
+
+- Make a function that can save/load an App object to/from persistent storage (JSON file with unique App ID as file name)
+
+- Make a function (using the above fn) that loads an array of all Apps
+*/