Add first version of open data license list #87.

[Ludee]

Info, please do not merge yet. There are some aspects missing:

• Use of self written "terms of use"
• A machine readable list of licenses to check for the review process

[christian-rli]

Nice draft! Once you're done, I would read over this again for a few minor expression changes. Only a couple comments:

• There are already lists of approved open-source licenses approved by who and for what?
• (e.g. OSI. In addition, there are some licenses that cover multiple material / domains (software, data, content) It would probably make sense to phrase that outside of the brackets and provide some more links
• and some that only cover a specific domains links or it didn't happen :)
• In my opinion the sentences above should go below the explanation of what an open license is.
• The open data licenses are grouped by obligations. I think it would be helpful to add a couple sentences under each heading that explains what that obligation is (i.e. more than just a word in brackets in the heading).

[christian-rli]

Good job! This closes a bunch of issues.

[Ludee]

Great review of the text. Thanks a lot!