feat: add podspec (#15)

react-native-image-editor.podspec

@@ -0,0 +1,19 @@
+require 'json'
+
+package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
+
+Pod::Spec.new do |s|
+  s.name         = "react-native-image-editor"
+  s.version      = package['version']
+  s.summary      = package['description']
+  s.license      = package['license']
+
+  s.authors      = package['author']
+  s.homepage     = package['homepage']
+  s.platform     = :ios, "9.0"
+
+  s.source       = { :git => "https://github.com/react-native-community/react-native-image-editor.git", :tag => "#{s.version}" }
+  s.source_files  = "ios/**/*.{h,m}"
+
+  s.dependency 'React'
+end