add cookie functionality

Added TODO: file

set maximum post body size to 4196 bytes

TODO: Add '\n' detector in thing

Applicacation-x-www-urlencoded forms

Result<&str, ParseFormError>>, ParseFormError> for easier handling of
not existant keys

add a get request with form

removing `unwraps()` and replacing them with propper error handling
remove unnecessary `clone()` calls

improve division of code into different modules

update routeing module

1. Organize lib.rs in modules
1. Setting up basic text-file server functionality
1. Adding some test files

returning a standard site