[Rprotobuf-yada] quick ref vignette

[Romain François]

Hi,

Added a one-pager vignette showcasing the most important features.

Next steps:
- check the vignettes
- cran release
- add html content here : http://rprotobuf.r-forge.r-project.org/
- announce on protobuf : so that we get added on the third party support 
page

Dirk, is everything sorted with the 2.2 version ?

Romain

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Romain Francois
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