work on README

README.md

-User documentation
-==================
+# User documentation
 
-Environments
-------------
+This is project contain IT4Innovation user documentation source.
+
+## Environments
 
 * [https://docs-new.it4i.cz - master branch](https://docs-new.it4i.cz - master branch)
 * [https://docs-new.it4i.cz/devel/$BRANCH_NAME](https://docs-new.it4i.cz/devel/$BRANCH_NAME) - maps the branches
 
-URLs
-----
+## URLs
 
 * [http://facelessuser.github.io/pymdown-extensions/](http://facelessuser.github.io/pymdown-extensions/)
 * [http://squidfunk.github.io/mkdocs-material/](http://squidfunk.github.io/mkdocs-material/)
 
-Rules
------
+## Rules
 
 * [spellcheck https://github.com/lukeapage/node-markdown-spellcheck](spellcheck https://github.com/lukeapage/node-markdown-spellcheck)
 
@@ -27,3 +25,33 @@ RedHat
 CentOS
 Mellanox
 ```
+
+## Developemnt Environment
+
+### MkDocs
+
+Documentation pages are build with [MkDocs](http://www.mkdocs.org/), [MkDocs at GitHub](https://github.com/mkdocs/mkdocs/). You need to install mkdocs loacally so that you can build the pages and run developement web server.
+
+```bash
+pip install mkdocs pygments pymdown-extensions
+```
+
+You can build the pages with `mkdocs build`.
+
+```bash
+‹hrb33-toshiba› 11:47 $ mkdocs build
+INFO    -  Cleaning site directory
+INFO    -  Building documentation to directory: /home/hrb33/Dokumenty/dev/it4i/docs.it4i.git/site
+```
+
+You can start local server with `mkdocs serve`.
+
+```bash
+✔ ~/Dokumenty/dev/it4i/docs.it4i.git [readme L|✚ 1…6⚑ 1]
+‹hrb33-toshiba› 11:47 $ mkdocs serve
+INFO    -  Building documentation...
+INFO    -  Cleaning site directory
+[I 170124 11:47:27 server:283] Serving on http://127.0.0.1:8000
+[I 170124 11:47:27 handlers:60] Start watching changes
+[I 170124 11:47:27 handlers:62] Start detecting changes
+```