Adds cocoapods and a readme of how to get the package (#5771)

swift/FlatBuffers.podspec

@@ -0,0 +1,21 @@
+Pod::Spec.new do |s|
+  s.name             = 'FlatBuffers'
+  s.version          = '0.1.0'
+  s.summary          = 'FlatBuffers: Memory Efficient Serialization Library'
+
+  s.description      = "FlatBuffers is a cross platform serialization library architected for
+  maximum memory efficiency. It allows you to directly access serialized
+  data without parsing/unpacking it first, while still having great 
+  forwards/backwards compatibility."
+
+  s.homepage         = 'https://github.com/google/flatbuffers'
+  s.license          = { :type => 'Apache2.0', :file => 'LICENSE' }
+  s.author           = { 'mustii' => 'mustii@mmk.one' }
+  s.source           = { :git => 'https://github.com/mustiikhalil/flatbuffers.git', :tag => s.version.to_s, :submodules => true }
+
+  s.ios.deployment_target = '11.0'
+  s.osx.deployment_target = '10.14'
+
+  s.swift_version = '5.0'
+  s.source_files = 'Sources/**/*'
+end