add basic multithreaded TCP server
add method to get HTTP verb from header
add method to get HTTP resource from header
refactor server into class
add method to create HTTP response
default content_type to text/html
fix get_http_method and get_resource methods
make methods private within server class
add method to load resource from file
add http response with loaded resource
allow terminal params to set port and root
add dynamic error file
minor formatting changes