Support CocoaPods

Closes #9

Defaults.podspec

@@ -0,0 +1,16 @@
+Pod::Spec.new do |s|
+	s.name = 'Defaults'
+	s.version = '0.2.1'
+	s.license = { :type => 'MIT', :file => 'license' }
+	s.homepage = 'https://github.com/sindresorhus/Defaults'
+	s.social_media_url = 'https://twitter.com/sindresorhus'
+	s.authors = { 'Sindre Sorhus' => 'sindresorhus@gmail.com' }
+	s.summary = 'Swifty and modern UserDefaults'
+	s.source = { :git => 'https://github.com/sindresorhus/Defaults.git', :tag => "v#{s.version}" }
+	s.source_files = 'Sources/*.swift'
+	s.swift_version = '4.1'
+	s.osx.deployment_target = '10.12'
+	s.ios.deployment_target = '10.0'
+	s.tvos.deployment_target = '10.0'
+	s.watchos.deployment_target = '3.0'
+end

readme.md

@@ -21,18 +21,24 @@
 
 ## Install
 
-With [SPM](https://swift.org/package-manager/):
+#### SPM
 
 ```swift
 .package(url: "https://github.com/sindresorhus/Defaults", from: "0.2.0")
 ```
 
-With [Carthage](https://github.com/Carthage/Carthage):
+#### Carthage
 
 ```
 github "sindresorhus/Defaults"
 ```
 
+#### CocoaPods
+
+```
+pod 'Defaults'
+```
+
 <a href="https://www.patreon.com/sindresorhus">
 	<img src="https://c5.patreon.com/external/logo/become_a_patron_button@2x.png" width="160">
 </a>