Add podspec

Author: killian90

RNCallKit.podspec

@@ -0,0 +1,18 @@
+require 'json'
+
+package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
+
+Pod::Spec.new do |s|
+  s.name                = "RNCallKit"
+  s.version             = "1.1.3"
+  s.summary             = package['description']
+  s.homepage            = "https://github.com/ianlin/react-native-callkit"
+  s.license             = "ISC"
+  s.author              = "ianlin"
+  s.source              = { :git => package['repository']['url'], :tag => "v#{s.version}" }
+  s.requires_arc        = true
+  s.platform            = :ios, "8.0"
+  s.source_files        = "ios/RNCallKit/*.{h,m}"
+  s.dependency 'React/Core'
+end
+