Adding a README for computed property example.
Unchanged text from JS version
Tweaking the markdown.
Incorporating feedback and adding "The code" section.
Tweaking markdown
Incorporating feedback.
Breaking up one of the lines.
Breaking on 80 chars
More tweaks.
Tweak tweak.
Tweak
Fixed typo.
Final tweaks.
First draft
tweaks
Tweak tweak
Merge pull request #8 from dart-lang/computed-property-readme

Adding a README for computed property example.
Merge pull request #9 from dart-lang/insertion_points_with_select

Insertion points with select
correct typo control to content
Merge pull request #10 from luisvt/patch-1

correct typo control to content