Create general.md

## Text formatting
1. *Use tabs instead of whitespace for indent*. First of all tabs are intended for that thing. Second, if you prefer
indentation equals to 3 character you can use settings for that in your IDE or editor. And only you will see it as 
3 whitespace. Otherwise everyone will get your code with 3 whitespace and will have to adapt his habits to yours.
2. *80 characters length of the line*. Is preferred but do not be too bully about it.