Add estimate of RAM requirements in the README
- with KTD running since some time
- used
free -m
and did the sum of used RAM + used SWAP - closed KTD
- recalculated used RAM
- subtracted with when KTD was running
- reran KTD
- monitored startup to see where is the peak, it's after having started
- did some requests: patron search, catalogue search, multiple record detail pages
- found the peak, calculated used RAM
- closed KTD
- waited a bit, calculated used RAM
- did again the subtraction
- kept the value of the test giving the highest usage (the freshly started one, odd)