Mention wiki in build instructions

Author: howetuft

README.md

@@ -12,6 +12,12 @@ You can find more information about at https://www.luxcorerender.org
 
 ### Building
 
+#### Build documentation
+Complete build documentation can be found in the wiki: https://wiki.luxcorerender.org/Building_LuxCoreRender.
+
+Here is a short extract, please refer to link above for more information.
+
+
 #### Tool requirements
 [Mandatory] First, ensure you have a suitable toolchain:
 - Windows: MSVC >= 194x _latest version_
@@ -69,6 +75,7 @@ Available build types are `Release` and `Debug` (case sensitive). Default is
 - `make doc`: build Doxygen documentation
 
 
+
 ### LuxCore library
 
 LuxCore is the new LuxCoreRender v2.x C++ and Python API. It is released under