Merge pull request #2 from zachpanter/FEATURE-add-atbash-cipher

Added atbash coder as option

Updated README.md

Added ROT 13 encoder and decoder

Code cleaning

Removed unused settings.
Changed Classname of Plugin.
Better description for Plugin.

changed plugin id

Changed Plugin name and ID

due to problems in the github actions of obsidian the ID and name of the plugin had to be changed.

Commented Decoder for base64

First version will have for testing reasons only the text-2-base64 coder