Adds documentation section about the idx file format.
Adds documentation section about the idx file format.

kirbyfan64/Nim,MrJohz/Nim,dom96/Nim,judofyr/Nim,zachaysan/Nim,sferik/Nim,judofyr/Nim,endragor/Nim,jsanjuas/Nim,msmith491/Nim,kirbyfan64/Nim,singularperturbation/Nim,zachaysan/Nim,nimLuckyBull/Nim,kirbyfan64/Nim,singularperturbation/Nim,nimLuckyBull/Nim,xland/Nim,msmith491/Nim,Matt14916/Nim,bvssvni/Nim,endragor/Nim,endragor/Nim,nimLuckyBull/Nim,SSPkrolik/Nim,Dhertz/Nim,haiodo/Nim,MrJohz/Nim,fredericksilva/Nim,kirbyfan64/Nim,greyanubis/Nim,sferik/Nim,Senketsu/Nim,SSPkrolik/Nim,SSPkrolik/Nim,bvssvni/Nim,zachaysan/Nim,SSPkrolik/Nim,sarvex/Nim-lang,gokr/Nim,reactormonk/nim,tulayang/Nim,greyanubis/Nim,singularperturbation/Nim,Senketsu/Nim,douglas-larocca/Nim,greyanubis/Nim,endragor/Nim,endragor/Nim,greyanubis/Nim,sarvex/Nim-lang,jfhg/Nim,greyanubis/Nim,Salafit/Nim,russpowers/Nim,gokr/Nim,msmith491/Nim,BlaXpirit/nim,reactormonk/nim,Matt14916/Nim,mbaulch/Nim,Matt14916/Nim,fredericksilva/Nim,bvssvni/Nim,dom96/Nim,xland/Nim,sarvex/Nim-lang,nanoant/Nim,jsanjuas/Nim,haiodo/Nim,tulayang/Nim,zachaysan/Nim,kirbyfan64/Nim,greyanubis/Nim,mbaulch/Nim,reactormonk/nim,nanoant/Nim,jsanjuas/Nim,BlaXpirit/nim,MrJohz/Nim,mbaulch/Nim,russpowers/Nim,Salafit/Nim,fredericksilva/Nim,xland/Nim,SSPkrolik/Nim,nimLuckyBull/Nim,nafsaka/Nim,xland/Nim,BlaXpirit/nim,fmamud/Nim,russpowers/Nim,douglas-larocca/Nim,BlaXpirit/nim,dom96/Nim,Salafit/Nim,gokr/Nim,endragor/Nim,Senketsu/Nim,Dhertz/Nim,jsanjuas/Nim,fredericksilva/Nim,nanoant/Nim,jsanjuas/Nim,Salafit/Nim,Dhertz/Nim,tmm1/Nim,sferik/Nim,BlaXpirit/nim,Matt14916/Nim,jfhg/Nim,tulayang/Nim,haiodo/Nim,haiodo/Nim,Salafit/Nim,singularperturbation/Nim,judofyr/Nim,sarvex/Nim-lang,tulayang/Nim,Matt14916/Nim,endragor/Nim,JCavallo/Nim,douglas-larocca/Nim,Salafit/Nim,JCavallo/Nim,JCavallo/Nim,jfhg/Nim,tmm1/Nim,jsanjuas/Nim,fmamud/Nim,Dhertz/Nim,nafsaka/Nim,haiodo/Nim,zachaysan/Nim,mbaulch/Nim,Senketsu/Nim,dom96/Nim,douglas-larocca/Nim,msmith491/Nim,nanoant/Nim,JCavallo/Nim,russpowers/Nim,judofyr/Nim,nafsaka/Nim,Salafit/Nim,tmm1/Nim,kirbyfan64/Nim,msmith491/Nim,BlaXpirit/nim,SSPkrolik/Nim,gokr/Nim,tmm1/Nim,xland/Nim,MrJohz/Nim,kirbyfan64/Nim,tmm1/Nim,singularperturbation/Nim,nanoant/Nim,russpowers/Nim,haiodo/Nim,Matt14916/Nim,msmith491/Nim,mbaulch/Nim,judofyr/Nim,BlaXpirit/nim,Senketsu/Nim,fredericksilva/Nim,reactormonk/nim,fmamud/Nim,MrJohz/Nim,sferik/Nim,judofyr/Nim,zachaysan/Nim,reactormonk/nim,russpowers/Nim,sarvex/Nim-lang,Senketsu/Nim,tulayang/Nim,kirbyfan64/Nim,dom96/Nim,tmm1/Nim,judofyr/Nim,nimLuckyBull/Nim,Senketsu/Nim,sferik/Nim,nimLuckyBull/Nim,gokr/Nim,jfhg/Nim,fmamud/Nim,xland/Nim,tmm1/Nim,nafsaka/Nim,nafsaka/Nim,mbaulch/Nim,JCavallo/Nim,MrJohz/Nim,xland/Nim,nanoant/Nim,sarvex/Nim-lang,sferik/Nim,zachaysan/Nim,fmamud/Nim,SSPkrolik/Nim,nimLuckyBull/Nim,reactormonk/nim,SSPkrolik/Nim,douglas-larocca/Nim,JCavallo/Nim,jfhg/Nim,jfhg/Nim,MrJohz/Nim,Dhertz/Nim,douglas-larocca/Nim,bvssvni/Nim,JCavallo/Nim,fredericksilva/Nim,Matt14916/Nim,jfhg/Nim,bvssvni/Nim,BlaXpirit/nim,sferik/Nim,fredericksilva/Nim,gokr/Nim,dom96/Nim,douglas-larocca/Nim,sferik/Nim,gokr/Nim,tulayang/Nim,fmamud/Nim,douglas-larocca/Nim,dom96/Nim,nafsaka/Nim,judofyr/Nim,greyanubis/Nim,reactormonk/nim,russpowers/Nim,Dhertz/Nim,Dhertz/Nim,mbaulch/Nim,jsanjuas/Nim,bvssvni/Nim,fredericksilva/Nim,nanoant/Nim,msmith491/Nim,nafsaka/Nim,haiodo/Nim,fmamud/Nim,singularperturbation/Nim,gokr/Nim,reactormonk/nim,bvssvni/Nim,sarvex/Nim-lang,singularperturbation/Nim