add podspec.

KYNavigationProgress.podspec

@@ -0,0 +1,14 @@
+Pod::Spec.new do |s|
+  s.name         = "KYNavigationProgress"
+  s.version      = "1.0.0"
+  s.summary      = "KYNavigationProgress is simple extension of UINavigationController to display progress on the UINavigationBar."
+  s.homepage     = "https://github.com/ykyouhei/KYNavigationProgress"
+  s.license      = "MIT"
+  s.author       = { "Kyohei Yamaguchi" => "[email protected]" }
+  s.social_media_url   = "https://twitter.com/kyo__hei"
+  s.platform     = :ios
+  s.source       = { :git => "https://github.com/ykyouhei/KYNavigationProgress.git", :tag => s.version.to_s }
+  s.source_files = "KYDrawerController/*.swift"
+  s.requires_arc = true
+  s.ios.deployment_target = '8.0'
+end