[React Native] Add CocoaPods spec

Libraries/Image/RCTNetworkImage.podspec

@@ -1,28 +0,0 @@
-Pod::Spec.new do |spec|
-  spec.name         = 'RCTNetworkImage'
-  spec.version      = '0.0.1'
-  spec.summary      = 'Provides basic Text capabilities in ReactNative apps.'
-  spec.description  = <<-DESC
-    Text can be rendered in ReactNative apps with the <Text> component using this module.
-                   DESC
-  spec.homepage     = 'https://facebook.github.io/react-native/'
-  spec.license      = { :type => 'BSD' }
-  spec.author       = 'Facebook'
-  spec.platform     = :ios, '7.0'
-  spec.requires_arc = true
-  spec.source_files  = '**/*.{h,m,c}'
-  spec.dependency "ReactKit", "~> 0.0.1"
-
-  # ――― Project Linking ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
-  #
-  #  Link your library with frameworks, or libraries. Libraries do not include
-  #  the lib prefix of their name.
-  #
-
-  # s.framework  = "SomeFramework"
-  # s.frameworks = "SomeFramework", "AnotherFramework"
-
-  # s.library   = "iconv"
-  #spec.libraries = "RCTNetworkImage", "ReactKit"
-
-end