add config: allow surrounding output with backticks

[rvictorino]

Hi,

thank you for this amazing work.

I needed a few extra features for a project of mine, so I added them myself.

Since I don't know if you are welcoming new additions or if this feature even is on your roadmap, feel free to reject this PR.

If you want to discuss around this work, please do.

Anyway, if you would like to know more about what I did:

The idea was that I wanted to be able to directy preview output file. I therefore needed it to have the proper backticks characters for parsers to understand it.

• Added a new config entry: encloseWithMermaidBackticks (boolean)
• If this entry is not set, or false, behaviour will be default (nothing more than what mermerd already does)
• If this entry is set to true, it will prefix output by "mermaid", and insert "" right before the ending new lines.

Have a great day,

[KarnerTh]

Thanks for the PR and the detailed description!
This feature is sure to be useful for others as well and your implementation fits perfectly - I will happily accept the PR.

FYI: after the merge I will update the readme and also add the possibility to set the config via the command line (also the go.mod and go.sum seem a bit weird) . After that I will publish a new version.

[KarnerTh]

@rvictorino The new version with your feature is available (v0.0.5)

I fixed the issue that you added the backticks suffix multiple times after each table definition, which breaks the diagram if you have multiple tables or constraints e.g. in the GitHub markdown previewer. If I got it right, all the mermaid syntax needs to be in one opening and closing block.

[rvictorino]

Thanks for your quick feedback. Your are right, the prefix and suffix must only be added once. Sorry that I missed that ! (I'm totally new to golang).

Thanks again for the great work