Update MBition CLA and imprint

[gunnar-mb]

Proposed changes:

• Making two copies of contributions file so that each one points to the right FOSS Co.
• Add MBition CLA PDF
• Correcting management names and emails in PROVIDER_INFORMATION / IMPRINT.

[cwege]

@gunnar-mb I can review and approve. But I have some doubts about the impact or renaming the CLA.
@AnishaM7 @GATHYAM what happens with the CLA bot if we change the name of the CLA? And can we inform all users of the current file about the change?
@gunnar-mb maybe we need to introduce at mbition-specific file first and leave the existing intact for now.

[gunnar-mb]

OK, let's check first. Thanks for reviewing.
(We would love to use CLA bot also, by the way, so maybe we can sync up on how we may achieve that, with the MBition CLA also @AnishaM7 @GATHYAM ?)