WIP Initial draft of DocBook build instructions

docbook/README.md

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+
+# Sources of the documentation are written in the DocBook format
+
+It builds automatically when you push your changes to the GitHub,
+but you may want to check how it looks before pushing changes.
+
+To check how it looks without pushing changes you have to prepare your
+machine to build DocBook 5.1.
+
+## Build
+
+If you are new to DocBook and XLST precessor check out good introductory video
+["Installing and Using Saxon for your XSLT Development" by Peter K. Johnson](https://youtu.be/FsDq2-VV0Uo)
+
+### Prerequisites
+
+* [Java 8](https://www.java.com/en/download/)
+* [Saxon-PE](http://www.saxonica.com/download/java.xml)
+
+### Building
+
+Run from the project root folder:
+```
+java -jar saxon9pe.jar -xsl:./docbook/T1/WG3/XLIFF-EM-BP.xml_xslt -s:./docbook/T1/WG3/ -o:./docs/
+```