Add examples to README of getting cue times in seconds, and reading from string

README.md

@@ -24,17 +24,24 @@ To parse a webvtt file:
 require "webvtt"
 
 webvtt = WebVTT.read("path/sub.vtt")
+
 webvtt.cues.each do |cue|
   puts "identifier: #{cue.identifier}"
-  puts "Start: #{cue.start}"
-  puts "End: #{cue.end}"
+  puts "Start: #{cue.start.to_s}, #{cue.start.to_f} seconds"
+  puts "End: #{cue.end.to_s}, #{cue.end.to_f} seconds"
   puts "Style: #{cue.style.inspect}"
   puts "Text: #{cue.text}"
   puts "Plain text: #{cue.plain_text}" # text without style tags if any
   puts "--"
 end
 ```
 
+To read from a string:
+
+```ruby
+webvtt == WebVTT.from_blog(string)
+```
+
 ## Converting from SRT
 
 You can also convert an SRT file to a standard WebVTT file: