Add CocoaPods support

.ruby-version

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+2.6.5

NSAttributedStringBuilder.podspec

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+#
+# Be sure to run `pod lib lint NSAttributedStringBuilder.podspec' to ensure this is a
+# valid spec before submitting.
+#
+# Any lines starting with a # are optional, but their use is encouraged
+# To learn more about a Podspec see https://guides.cocoapods.org/syntax/podspec.html
+#
+
+Pod::Spec.new do |s|
+  s.name             = 'NSAttributedStringBuilder'
+  s.version          = '0.3.1'
+  s.summary          = 'Composing NSAttributedString with SwiftUI-style syntax, powerd by the now pitching Function Builder.'
+
+# This description is used to generate tags and improve search results.
+#   * Think: What does it do? Why did you write it? What is the focus?
+#   * Try to keep it short, snappy and to the point.
+#   * Write the description between the DESC delimiters below.
+#   * Finally, don't worry about the indent, CocoaPods strips it!
+
+  s.description      = <<-DESC
+Composing NSAttributedString with SwiftUI-style syntax, powerd by the now pitching Function Builder.
+
+Project Link: https://github.com/ethanhuang13/NSAttributedStringBuilder
+                       DESC
+
+  s.homepage         = 'https://github.com/ethanhuang13/NSAttributedStringBuilder'
+  s.swift_versions   = '5.1'
+  # s.screenshots      = 'https://github.com/ethanhuang13/NSAttributedStringBuilder/blob/master/demo2.jpg', 
+                       'https://github.com/ethanhuang13/NSAttributedStringBuilder/blob/master/demo.jpg'
+  s.license          = { :type => 'MIT', :file => 'LICENSE' }
+  s.author           = { 'ethanhuang13' => '[email protected]' }
+  s.source           = { :git => 'https://github.com/ethanhuang13/NSAttributedStringBuilder.git', :tag => s.version.to_s }
+  s.social_media_url = 'https://twitter.com/ethanhuang13'
+
+  s.ios.deployment_target = '8.0'
+
+  s.source_files = 'Sources/NSAttributedStringBuilder/*',
+                   'Sources/NSAttributedStringBuilder/Components/*'
+end