Added features to EvseV2G doc.rst

[SebaLukas]

Describe your changes

Adding a features.md. This document contains two feature lists to show the current DIN70121 and ISO15118-2 support.

Issue ticket number and link

Without a feature list, it is quite difficult to get an overview of which DIN70121 and ISO15118-2 features EvseV2G already supports.

Checklist before requesting a review

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• I read the contribution documentation and made sure that my changes meet its requirements

[barsnick]

This looks correct. One typo though.
(Do also note the Codacy line length "issue".)

[barsnick]

I don't have an RST parser. :D

Otherwise LGTM.