Changes

Add get_status function to make StatusCode accessible
Add doctests to Request module methods
Add path parameter to get, post, put patch, delete methods in Router module
Add get_query_param method to Request for handling query parameters easily
Update insert_header to set_header
Update update_body to set_body
Update add_local to set_local
Update is_err to is_error
Update get_header return type from Option<&String> to Option<&str>
Update get_path return type from &String to &str
Update name of get_queries method to get_query_params
Update get_method to make method public
Update request body parser to handle body better
Update request parser
Update Request module to improve documentation

Fixes