Add presets readme

Author: solcloud

presets/README.md

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