reference as new property batch 1

[toscalix]

Reference as new property:

• Added the description and the values to the description file
• Added the example entry to the CONTRIBUTING.md file
• Added the references corresponding to the first batch of algorithms, according to the table Proposal of a new property: reference #9 (comment)

As a result of this action, #47 has been created.

As opportunistic changes...

• id and name fields in the description document are now in lower case, for consistency
• cast specifiedKey has been added

[stevenc-stb]

just a thought... do we need to name it reference 1: ... reference 2: or can we just name it reference:

reference 1: https://doi.org/10.17487/RFC2144
reference 2: https://tnlandforms.us/cs594-cns96/cast.pdf

to

reference: https://doi.org/10.17487/RFC2144
reference: https://tnlandforms.us/cs594-cns96/cast.pdf