Merge pull request skonfig#15 from skonfig/4nd3r/update_readme2

update README

README.md

@@ -1,16 +1,30 @@
 # skonfig extra set
 
-This is a set of extra types for use with the [skonfig](https://skonfig.li) configuration management system.
+[skonfig](https://skonfig.li) is a configuration management system forked from [cdist](https://cdi.st)
+(after [e250024](https://code.ungleich.ch/ungleich-public/cdist/commit/e2500248f2ddc83129e77f2e6b8dffb64904dbae)).
 
-Work is mostly split between three main repositories:
+We have three main repositories:
 
 * [skonfig](https://github.com/skonfig/skonfig) - implementation of the **skonfig tool** and quick **getting started** bits,
-* [base](https://github.com/skonfig/base) - **base** explorers and types,
-* **extra** - **extra** types (community contributions).
+* [base](https://github.com/skonfig/base) - explorer and types for **general use**,
+* **extra** - **special purpose** types and incubator for new types.
 
-## base vs extra?
+You can find us in `#skonfig:matrix.org` ([matrix?](https://matrix.org/faq/)).
 
-Explorers and types which are related to changing state of the operating
-system or core components of it and are not strictly related to some specific
-piece of software, are considered base.
-Furthermore, the quality requirements for inclusion in base are higher than for extra.
+## Documentation
+
+Most parts of [cdist documentation](https://www.cdi.st/manual/latest/) apply, but there are differences:
+
+* `skonfig` does only `config` (see `skonfig -h`),
+* some types behave differently and it's recommended to consult manuals in *base* and *extra*.
+
+## Split between *base* and *extra*
+
+**Base** explorers and types are used to change the state of the operating
+system or core components of it and are not for some specific piece of
+software. Furthermore, the quality requirements for inclusion in base are
+higher than for extra.
+
+**Extra** contains types for specific purposes like configuring software or
+services which don't belong to the operating system and also serves as an
+incubator for new types.