Configured prettier

[Andarist]

Ive noticed in the other PR that there was some mismatch between PR code style and the desired style of the repo. This was also a slight problem for me when making changes as there were no linting rules around to help me and I had double check semicolon, quotes style etc - especially as I couldnt focus at one moment and was coming back to work several times when only I had some time.

This should help the situation - I've gone with the pure prettier as its super easy to add for the project and doesnt require too much configuration with its 'take it or leave it' approach.

Note: I would advice to merge this locally and run prettier on the whole project once - both to see the difference and judge if you like it or not and to commit the changes if liked.