docs: updated links to documentation pages from readme.md and for porting example

Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

CMakeLists.txt

   find_package (Doxygen)
   if (DOXYGEN_FOUND)
     configure_file (${CMAKE_CURRENT_SOURCE_DIR}/doxy/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile @ONLY)
+	configure_file (${CMAKE_CURRENT_SOURCE_DIR}/docs/c++.png ${CMAKE_CURRENT_BINARY_DIR}/html/docs/c++.png COPYONLY)
+	configure_file (${CMAKE_CURRENT_SOURCE_DIR}/docs/python.png ${CMAKE_CURRENT_BINARY_DIR}/html/docs/python.png COPYONLY)
+	configure_file (${CMAKE_CURRENT_SOURCE_DIR}/docs/node.png ${CMAKE_CURRENT_BINARY_DIR}/html/docs/node.png COPYONLY)
     add_custom_target (doc
       ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
       WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}

README.md

 If you are providing a fix with significant changes, feel free to add yourself
 as a contributor. Signing-off your commits is mandatory.
 
-C/C++ API Documentation
+API Documentation
 ==============
 
-The C/C++ documentation is available [here](http://iotdk.intel.com/docs/master/upm/).
+@htmlonly
+
+<a href="http://iotdk.intel.com/docs/master/upm/"><img src="docs/c++.png"/></a>
+<a href="http://iotdk.intel.com/docs/master/upm/python"><img src="docs/python.png"/></a>
+<a href="http://iotdk.intel.com/docs/master/upm/node"><img src="docs/node.png"/></a>
+
+@endhtmlonly
 
 Version @ref changelog [here](docs/changelog.md).
 

docs/max31855.md

 
 Our final example, very easy to use API!
 
-@snippet examples/max31855.cxx Interesting
+@snippet examples/c++/max31855.cxx Interesting
 
 ### Building