Allow creation of own charging cards

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/allow-creation-of-own-charging-cards/
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Some people are locked into old tariffs not available anymore through the charging card or have discounted tariffs not available to the general public. It would be great to be able to create a charging tariff (or card) by selecting the network it applies to and providing pricing information. This tariff should only be visible to the user who created it.