Add podspec file (#52)

Author: igrayson

react-native-image-resizer.podspec

@@ -0,0 +1,20 @@
+require 'json'
+
+package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
+
+Pod::Spec.new do |s|
+  s.name     = "react-native-image-resizer"
+  s.version  = package['version']
+  s.summary  = package['description']
+  s.homepage = "https://github.com/bamlab/react-native-image-resizer"
+  s.license  = package['license']
+  s.author   = package['author']
+  s.source   = { :git => "https://github.com/bamlab/react-native-image-resizer.git", :tag => "v#{s.version}" }
+
+  s.platform = :ios, "8.0"
+
+  s.preserve_paths = 'README.md', 'LICENSE', 'package.json', 'index.js'
+  s.source_files   = "ios/RCTImageResizer/*.{h,m}"
+
+  s.dependency 'React'
+end