add Podspec file for cocoapods users
add Podspec file for cocoapods users

JanX2/google-diff-match-patch-Objective-C,JanX2/google-diff-match-patch-Objective-C,mpapp/google-diff-match-patch-Objective-C,mpapp/google-diff-match-patch-Objective-C,mpapp/google-diff-match-patch-Objective-C,JanX2/google-diff-match-patch-Objective-C