Examples in documentation

[andreaTP]

Currently, there are only limited examples of the various guest languages that can be integrated.

We have a bunch of examples in the testsuite but most of them lack a simple "data-transfer"(using Memory if available and Wasi otherwise) example.

We should integrate, at least:

• Rust
• C
• TinyGo
• QuickJs
• C#

[andreaTP]

I keep being asked about this subject, especially for Go/Tiny go.
I'd eventually bump priority of this, but all the help is appreciated.