Add documentation

core/http/src/handlers/handler.rs

core/http/src/handling/file_handlers.rs

core/http/src/handling/methods.rs

core/http/src/handling/request/datatypes.rs

core/http/src/handling/request/request_impl.rs

core/http/src/handling/response/cookie_management/cookie.rs

...src/handling/response/cookie_management/cookie_builder.rs

core/http/src/handling/response/cookie_management/mod.rs

core/http/src/handling/response/datatypes.rs

core/http/src/handling/response/mod.rs

core/http/src/handling/response/response.rs

core/http/src/handling/response/status.rs

core/http/src/handling/response/traits.rs

core/http/src/handling/routes.rs

core/http/src/setup.rs

core/http/src/utils/mime/map.rs

core/http/src/utils/mime/mime_enum.rs

core/http/src/utils/urlencoded/datatypes.rs

core/http/src/utils/urlencoded/endecode.rs