added podspec

DragonService.podspec

@@ -0,0 +1,23 @@
+Pod::Spec.new do |s|
+  s.name         = "DragonService"
+  s.version      = "0.0.2"
+  s.summary      = "A library to fetch data from Data Dragon."
+  s.description  = <<-DESC
+  A Swift library designed to fetch League of Legends static data from Riot Games DataDragon CDN.
+                   DESC
+
+  s.homepage     = "https://github.com/WxWatch/DragonService"
+  s.license      = "MIT"
+  s.author             = "WxWatch"
+
+  s.ios.deployment_target = "8.0"
+  s.osx.deployment_target = "10.10"
+  s.watchos.deployment_target = "2.0"
+  s.tvos.deployment_target = "9.0"
+
+  s.source       = { :git => "https://github.com/WxWatch/DragonService.git", :tag => "#{s.version}" }
+  s.source_files  = "Sources/**/*.swift"
+  s.dependency "Alamofire", "~> 4.7"
+  s.swift_version = "4"
+
+end