Search Screen: add People tab

- add contact picker view controller

Vector/ViewController/ContactPickerViewController.h

@@ -0,0 +1,69 @@
+/*
+ Copyright 2016 OpenMarket Ltd
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+#import <MatrixKit/MatrixKit.h>
+
+@class ContactPickerViewController;
+
+/**
+ `ContactPickerViewController` delegate.
+ */
+@protocol ContactPickerViewControllerDelegate <NSObject>
+
+/**
+ Tells the delegate that the user selected a contact.
+ 
+ @param contactPickerViewController the `ContactPickerViewController` instance.
+ @param contact the selected contact.
+ */
+- (void)contactPickerViewController:(ContactPickerViewController *)contactPickerViewController didSelectContact:(MXKContact*)contact;
+
+@end
+
+/**
+ `ContactPickerViewController` displays people search in user's rooms under a `HomeViewController` segment.
+ */
+@interface ContactPickerViewController : MXKViewController <UITableViewDelegate, UITableViewDataSource>
+
+@property (nonatomic) IBOutlet UITableView *contactsTableView;
+@property (weak, nonatomic) IBOutlet UILabel *noResultsLabel;
+
+/**
+ The delegate for the view controller.
+ */
+@property (nonatomic) id<ContactPickerViewControllerDelegate> delegate;
+
+/**
+ Returns the `UINib` object initialized for a `ContactPickerViewController`.
+ 
+ @return The initialized `UINib` object or `nil` if there were errors during initialization
+ or the nib file could not be located.
+ */
++ (UINib *)nib;
+
+/**
+ Creates and returns a new `ContactPickerViewController` object.
+ 
+ @discussion This is the designated initializer for programmatic instantiation.
+ @return An initialized `ContactPickerViewController` object if successful, `nil` otherwise.
+ */
++ (instancetype)contactPickerViewController;
+
+/**
+ */
+- (void)searchWithPattern:(NSString *)searchText;
+
+@end