Show post visibility levels

lib/enums/post_visibility_level.dart

@@ -1,5 +1,15 @@
+import 'package:flutter/material.dart';
+
 /// Post visibility level
 ///
 /// @author Pierre HUBERT
 
 enum PostVisibilityLevel { PUBLIC, FRIENDS, USER, GROUP_MEMBERS }
+
+/// Post visibility levels mapping with material icons
+const PostVisibilityLevelsMapIcons = {
+  PostVisibilityLevel.USER: Icons.lock,
+  PostVisibilityLevel.FRIENDS: Icons.group,
+  PostVisibilityLevel.GROUP_MEMBERS: Icons.group,
+  PostVisibilityLevel.PUBLIC: Icons.public
+};

lib/ui/tiles/post_tile.dart

@@ -2,6 +2,7 @@ import 'dart:io';
 
 import 'package:comunic/enums/likes_type.dart';
 import 'package:comunic/enums/post_kind.dart';
+import 'package:comunic/enums/post_visibility_level.dart';
 import 'package:comunic/helpers/comments_helper.dart';
 import 'package:comunic/helpers/likes_helper.dart';
 import 'package:comunic/helpers/posts_helper.dart';
@@ -97,6 +98,14 @@ class _PostTileState extends State<PostTile> {
           ),
         ),
 
+        PopupMenuButton(
+          child: Icon(
+            PostVisibilityLevelsMapIcons[widget.post.visibilityLevel],
+            color: Colors.grey,
+          ),
+          itemBuilder: (c) => [],
+        ),
+
         PopupMenuButton<_PostActions>(
           itemBuilder: (c) => [
                 // Update post content