Added screens in sample app for notification

Summary:
Added a basic communication flows and a button to trigger notification
{F142016937}

Reviewed By: jknoxville

Differential Revision: D10492428

fbshipit-source-id: b65fc46b3be695852f9197771a253d9e8596f328

iOS/Sample/CommunicationDemoViewController.mm

@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2018-present, Facebook, Inc.
+ *
+ *  This source code is licensed under the MIT license found in the LICENSE
+ *  file in the root directory of this source tree.
+ *
+ */
+
+#import "CommunicationDemoViewController.h"
+#import <FlipperKitExamplePlugin/FlipperKitExamplePlugin.h>
+
+@interface CommunicationDemoViewController()<FlipperKitExampleCommunicationResponderDelegate>
+@property (strong, nonatomic) NSMutableArray<NSString *> *messagesToDisplay;
+@property (weak, nonatomic) IBOutlet UITextField *messageTextField;
+@property (weak, nonatomic) IBOutlet UITableView *tableView;
+@end
+
+@implementation CommunicationDemoViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    [FlipperKitExamplePlugin sharedInstance].delegate = self;
+}
+
+- (IBAction)tappedTriggerNotification:(UIButton *)sender {
+    [[FlipperKitExamplePlugin sharedInstance] triggerNotification];
+}
+
+- (IBAction)tappedSendMessage:(UIButton *)sender {
+    if (self.messageTextField.text.length > 0) {
+        [[FlipperKitExamplePlugin sharedInstance] sendMessage:self.messageTextField.text];
+    }
+}
+
+- (nonnull UITableViewCell *)tableView:(nonnull UITableView *)tableView cellForRowAtIndexPath:(nonnull NSIndexPath *)indexPath {
+    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reusableCell"];
+    cell.textLabel.text = self.messagesToDisplay[indexPath.row];
+    return cell;
+}
+
+- (NSInteger)tableView:(nonnull UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
+    return self.messagesToDisplay.count;
+}
+
+- (void)messageReceived:(NSString *)msg {
+    if (msg) {
+        if (!self.messagesToDisplay) {
+            self.messagesToDisplay = @[].mutableCopy;
+        }
+        [self.messagesToDisplay addObject:msg];
+        dispatch_async(dispatch_get_main_queue(), ^{
+            [self.tableView reloadData];
+        });
+    }
+}
+
+@end