Added license file and podspec.

Author: Robert Murray

LICENSE

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+MIT License
+
+Copyright (c) TaskRabbit, Inc. and its affiliates.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

RNZendeskChat.podspec

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+require 'json'
+
+package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
+
+Pod::Spec.new do |s|
+  s.name         = "RNZendeskChat"
+  s.version      = package['version']
+  s.summary      = package['description']
+  s.license      = package['license']
+  s.authors      = package['author']
+  s.homepage     = package['homepage']
+  s.platform     = :ios, "9.3"
+  s.source       = { :git => "https://github.com/taskrabbit/react-native-zendesk-chat.git", :tag => "v#{s.version}" }
+  s.source_files = "ios/*.{h,m}"
+  s.static_framework = true
+
+  s.framework    = 'Foundation'
+  s.framework    = 'UIKit'
+
+  s.dependency 'React'
+  s.dependency 'ZDCChat'
+end