Add podspec

RxKeyboard.podspec

@@ -0,0 +1,22 @@
+Pod::Spec.new do |s|
+  s.name             = 'RxKeyboard'
+  s.version          = '0.1.0'
+  s.summary          = 'Reactive Keyboard in iOS'
+  s.homepage         = 'https://github.com/devxoul/RxKeyboard'
+  s.license          = { :type => 'MIT', :file => 'LICENSE' }
+  s.author           = { 'Suyeol Jeon' => 'devxoul@gmail.com' }
+  s.source           = { :git => 'https://github.com/devxoul/RxKeyboard.git',
+                         :tag => s.version.to_s }
+  s.source_files     = 'Sources/*.swift'
+  s.frameworks       = 'UIKit', 'Foundation'
+  s.requires_arc     = true
+
+  s.dependency 'RxSwift', '= 3.0.0-beta.2'
+  s.dependency 'RxCocoa', '= 3.0.0-beta.2'
+
+  s.ios.deployment_target = '8.0'
+
+  s.pod_target_xcconfig = {
+    'SWIFT_VERSION' => '3.0'
+  }
+end