TF-1379 Add privacy policy in login screen

lib/features/login/presentation/privacy_link_widget.dart

@@ -0,0 +1,30 @@
+import 'package:core/presentation/extensions/color_extension.dart';
+import 'package:flutter/gestures.dart';
+import 'package:flutter/widgets.dart';
+import 'package:tmail_ui_user/main/localizations/app_localizations.dart';
+import 'package:url_launcher/url_launcher_string.dart';
+
+class PrivacyLinkWidget extends StatelessWidget {
+  static const linagoraPrivacy = 'https://www.linagora.com/en/legal/privacy';
+
+  final String privacyUrlString;
+
+  const PrivacyLinkWidget({Key? key, this.privacyUrlString = linagoraPrivacy}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return RichText(
+      text: TextSpan(
+        text: AppLocalizations.of(context).privacyPolicy,
+        style: const TextStyle(
+          color: AppColor.loginTextFieldFocusedBorder,
+          fontSize: 14),
+        recognizer: TapGestureRecognizer()..onTap = () async {
+          if (await canLaunchUrlString(privacyUrlString)) {
+            launchUrlString(privacyUrlString);
+          }
+        }
+      )
+    );
+  }
+}