Docs with an updated install instruction (#343)

Summary:
This PR updates the installation instruction. It missed few crucial information and thus the projects installing flipper as a dependency were facing issues. It addresses the issue #341. It also brings the sample application at par with the documentation.
Pull Request resolved: https://github.com/facebook/flipper/pull/343

Reviewed By: danielbuechele

Differential Revision: D13507298

Pulled By: priteshrnandgaonkar

fbshipit-source-id: 5a4b23d79930cb7eeb491e359b616d3558e260fb

iOS/Sample/AppDelegate.m

@@ -0,0 +1,59 @@
+/*
+ *  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 "AppDelegate.h"
+#import <FlipperKit/FlipperClient.h>
+#import <FlipperKitLayoutPlugin/FlipperKitLayoutPlugin.h>
+#import <FlipperKitNetworkPlugin/FlipperKitNetworkPlugin.h>
+#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
+#import <FlipperKitLayoutComponentKitSupport/FlipperKitLayoutComponentKitSupport.h>
+#import <FlipperKitExamplePlugin/FlipperKitExamplePlugin.h>
+#import <SKIOSNetworkPlugin/SKIOSNetworkAdapter.h>
+#import <FlipperKitUserDefaultsPlugin/FKUserDefaultsPlugin.h>
+
+#import "MainViewController.h"
+#import "RootViewController.h"
+
+#if !FB_SONARKIT_ENABLED
+#error "Sample need to be run with SonarKit enabled in order to properly interact with Sonar. SonarKit is enabled by default if its a debug build."
+#endif
+
+@implementation AppDelegate {
+  UIWindow *_window;
+}
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
+{
+  _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+  FlipperClient *client = [FlipperClient sharedClient];
+
+  SKDescriptorMapper *layoutDescriptorMapper = [[SKDescriptorMapper alloc] initWithDefaults];
+  [FlipperKitLayoutComponentKitSupport setUpWithDescriptorMapper: layoutDescriptorMapper];
+  [client addPlugin: [[FlipperKitLayoutPlugin alloc] initWithRootNode: application
+                                               withDescriptorMapper: layoutDescriptorMapper]];
+
+  [client addPlugin:[[FKUserDefaultsPlugin alloc] initWithSuiteName:nil]];
+
+  [[FlipperClient sharedClient] addPlugin: [[FlipperKitNetworkPlugin alloc] initWithNetworkAdapter:[SKIOSNetworkAdapter new]]];
+  [client addPlugin:[FlipperKitExamplePlugin sharedInstance]];
+  [client start];
+
+  UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryBoard" bundle:nil];
+  MainViewController *mainViewController = [storyboard instantiateViewControllerWithIdentifier:@"MainViewController"];
+
+  UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController: mainViewController];
+  navigationController.navigationBar.topItem.title = @"Sample";
+  navigationController.navigationBar.translucent = NO;
+
+  [_window setRootViewController: [[UINavigationController alloc] initWithRootViewController: mainViewController]];
+  [_window makeKeyAndVisible];
+
+  NSLog(@"Hello from Flipper in an Objc app!");
+  return YES;
+}
+
+@end