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为UIKitDynamics添加README.md
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‎UIKitDynamics/README.md‎

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### 一篇文章学会使用UIKit Dynamics
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动力项(UIDynamicItem)是任何遵守`UIDynamicItem`协议的对象，相当于现实世界中的一个基本物体。自iOS 7开始，`UIView`和`UICollectionViewLayoutAttributes`默认实现了上述协议，你也可以自行实现该协议以便在自定义的类中使用动力效果动画(UIDynamicAnimator)，但很少需要这样做。
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动力行为(UIDynamicBehavior)为动力项(UIDynamicItem)提供不同的2D物理动画，即指定`UIDynamicItem`应该如何运动、适用哪些物理规则。在这里`UIDynamicBehavior`类似一个抽象类，没有实现具体行为，因此一般使用这个类的子类来对一组`UIDynamicItem`应遵守的行为规则进行描述。`UIDynamicBehavior`可以独立作用，多个动力行为同时作用时遵守力的合成。
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UIKit Dynamics库的核心在于`UIDynamicAnimator`，其封装了底层iOS物理引擎，是动力行为(UIDynamicBehavior)的容器，动力行为添加到容器内才会发挥作用，为动力项(UIDynamicItem)提供物理相关的功能和动画。
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使用动力学(dynamics)的步骤是：配置一个或多个`UIDynamicBehavior`，其中为每个`UIDynamicBehavior`指定一个或多个`UIDynamicItem`，最后添加这些`UIDynamicBehavior`到`UIDynamicAnimator`。
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在这个demo中，使用了UIGravityBehavior、UICollisionBehavior、UIPushBehavior、UIAttachmentBehavior、UISnapBehavior、UIFieldBehavior六种动力行为，详细介绍查看下面文章：
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<https://github.com/pro648/tips/wiki/一篇文章学会使用UIKit-Dynamics>

‎UIKitDynamics/UIKitDynamics.xcodeproj/.xcodeSampleCode.plist‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<!--
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.xcodeSampleCode.plist
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RegularExpression
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Created by ad on 25/12/2017.
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Copyright (c) 2017 ___ORGANIZATIONNAME___. All rights reserved.
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-->
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<plist version="1.0">
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<dict>
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</dict>
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</plist>

‎UIKitDynamics/UIKitDynamics.xcodeproj/project.pbxproj‎

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60BFE04E1EFBB18C0026923A /* FifthViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = FifthViewController.m; sourceTree = "<group>"; };
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60BFE0501EFBB23A0026923A /* TabBarController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TabBarController.h; sourceTree = "<group>"; };
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60BFE0511EFBB23A0026923A /* TabBarController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = TabBarController.m; sourceTree = "<group>"; };
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60CCE3F21FF293A7005A8FCA /* README.md */ = {isa = PBXFileReference; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
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/* End PBXFileReference section */
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/* Begin PBXFrameworksBuildPhase section */
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60BFE0101EFB98950026923A = {
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isa = PBXGroup;
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children = (
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60CCE3F21FF293A7005A8FCA /* README.md */,
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60BFE01B1EFB98960026923A /* UIKitDynamics */,
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60BFE0351EFB98960026923A /* UIKitDynamicsTests */,
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60BFE01A1EFB98960026923A /* Products */,

‎UIKitDynamics/UIKitDynamics.xcodeproj/project.xcworkspace/xcuserdata/ad.xcuserdatad/UserInterfaceState.xcuserstate‎

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‎UIKitDynamics/UIKitDynamics/SecondViewController.m‎

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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
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UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuseIdentifier forIndexPath:indexPath];
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if (cell==nil) {
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cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];
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}
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cell.textLabel.text = [NSString stringWithFormat:@"Option %li",indexPath.row + 1];
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cell.textLabel.textColor = [UIColor lightGrayColor];
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cell.textLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];

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