Adding default password criteria to sample config

[minhducsun2002]

This enables setting custom rules for passwords.

However, whether this option is mandatory in the configuration is up to upstream maintainers.

[dungwinux]

@minhducsun2002, this can be quite messy, you know

[minhducsun2002]

Hardcoding checks in the web app is not a good way to implement criteria for strings.

The more preferred method is a regular expression.

[dungwinux]

But hey, I can't find your implementation. There's only sample change

[minhducsun2002]

I see that you seem to be serving contest.json's content directly, so I simply put it there.

If you mean to add checks for this feature or Enquire entries to change that, sorry, working on that.

[dungwinux]

That's not how the config system work. Currently, it parses config while preserving as much as possible. That means it only read white-listed properties. See in src/util/config/contestConfig.js for more details.

[minhducsun2002]

Should work properly now.

[enbugging]

Hmm, anyone?

[dungwinux]

Hmm, anyone?

@MegumiTadokoro Feel free to contribute, at least after rebasing or resolving conflict