Add password rules for ccs-grp.com (resolves #610)

[svens-uk]

Resolves #610.

Explanation of rules

minlength: 8; required: digit; required: upper,lower;

These rules were collected through information provided on the website before submitting the form.

maxlength: 16;

This rule was collected from the error text displayed after submitting a password that was over the limit.

allowed: [-!#$%&'+./=?\\^_`{|}~];

This rule was gathered by testing each symbol (/\_-~ !@#$%^&*+=`|(){}[]:;"'<>,.?) one by one in an otherwise valid password. The website would throw the same error as above, which didn't mention anything about invalid symbols.

The invalid symbols are @%*+=`|()[]:;"<>,

Resolves

Overall Checklist

• [x] I agree to the project's Developer Certificate of Origin
• [x] The top-level JSON objects are sorted alphabetically
• [x] There are no open pull requests for the same update

for password-rules.json

• [x] The given rule isn't particularly standard and obvious for password managers
• [x] Generated passwords have been tested from this rule using the Password Rules Validation Tool
• [x] Information has been included about the website's requirements (eg. screenshots, error messages, steps during experimentation, etc.)
• [x] The PR isn't documenting something that would be a common practice among password managers (e.g. minimal length of 6)