Snippet file updated

Thanks for the review and feedback, the snippet file is updated according to the feedback. We will keep updating these snippets. The snippet file will be updated on the blog.

currently the snippets are from two sources:

1. the snippets generate the basic F# structures, such as for, while, if, etc
2. convert C# snippets to F#.

We try to control the snippet with shortcuts minimum and meanwhile continue to contribute to the one without shortcut.

If you are using code snippets and have some suggestion on some new snippets you like or dislike.  Please let us know.

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