Implemented error reporting solution

lib/core/model/github_error_report.model.dart

@@ -0,0 +1,9 @@
+class GithubErrorReport {
+  final String? shortDescription;
+  final String? longDescription;
+
+  GithubErrorReport({
+    this.shortDescription,
+    this.longDescription,
+  });
+}

lib/core/model/paperless_server_information.dart

@@ -0,0 +1,15 @@
+class PaperlessServerInformation {
+  static const String versionHeader = 'x-version';
+  static const String apiVersionHeader = 'x-api-version';
+  static const String hostHeader = 'x-served-by';
+  final String? version;
+  final int? apiVersion;
+  final String? username;
+  final String? host;
+  PaperlessServerInformation({
+    this.host,
+    this.username,
+    this.version = 'unknown',
+    this.apiVersion = 1,
+  });
+}