Add to the INSTALL.md file the mi_http and httpd modules

[pruonckk]

Hello,

I loss a couple of hours trying to figure out why the panel was not working, i was receiving a unable to parse url message, and this was because the mi_http.so module was not loaded, i beleave that this information could be on the INSTALL.md file

[razvancrainea]

That is a fair request, thanks for pointing it out! Feel free to open a new PR with the amended file, as you find it useful for others.

[pruonckk]

ok, i will do that, thank you