note about user presets

unless you are AK with qncvs preset I will probably not merge it :)

Author: solcloud

presets/README.md

@@ -1,11 +1,13 @@
 ## Presets
 
 NiceOS can build completely different target image based on set of rules called __preset__. 
-Before building you are required to select one preset. 
+Before building you are required to select one preset using NICE_PRESET variable. 
 
 Here are some inlcuded presets:
 - __[base](base/)__ - starting point for custom preset, if you are not expert at kernel configuration start here
 - __[dev](dev/)__ - my development environment featuring docker, [youtube](https://youtu.be/cPaDJTJbgwQ)
 - __[ghost](ghost/)__ - my main desktop machine, [youtube](https://youtu.be/SNuNFt7kSIE)
 - __[leti](leti/)__ - my laptop machine
 - __[minimal](minimal/)__ - simple ram disk only kernel + busybox binaries, but you can add anything to it of course [youtube](https://youtu.be/4CH8b0HnIu8)
+
+Of course user can provide [own preset](https://github.com/solcloud/NiceOS#users-presets) using NICE_PRESET_ROOT variable