ENH: remove readme of template remote module from MPIConfig module

Modules/MPI/MPIConfig/README

-General 
-=======
-
-This is a template module for the ORFEO
-Toolbox(https://www.orfeo-toolbox.org/). It is designed to work with OTBv5
-modular system and to be places in OTB/Module/Remote.
-
-This module is empty it is just a template to be used as a starting point for a
-module with actual content. It contains the template for sources (src folder),
-test (test folder) and application (app folder).
-
-Getting Started 
-===============
-
-The official OTB Wiki documentation on adding an external module is here:
-http://wiki.orfeo-toolbox.org/index.php/How_to_write_a_remote_module
-
-Remote Module
--------------
-
-After a module has been created as a git repository it can be included
-as a remote module, which enables automatic fetching. Add a file in
-"OTB/Modules/Remote" called "YourModule.remote.cmake", for this module
-it would be "ExternalExample.remote.cmake" with the followlowing contents:
-
-otb_fetch_module(ExternalTemplate
-  "A template for a module."
-  GIT_REPOSITORY https://github.com/orfeotoolbox/otbExternalModuleTemplate
-  GIT_TAG master
-  )
-
-Editing
-======= 
-
-The CMakeLists.txt and otb-modules need to be modified with the name of the
-module, something along the following:
-
-sed 's/ExternalTemplate/MyModule/g' CMakeLists.txt otb-module.cmake
-
-There is the inplace option to sed, but it's not portable, so do this change by
-hand or look up the option in sed.
-
-Then hack away at you code in include, src, test and app folders.
-
-License 
-=======
-
-This software is distributed under the Apache License. Please see LICENSE for
-details.
-
-Author 
-======
-
-Manuel Grizonnet
-
-Thanks 
-======
-
-It is a fork of the ITK template module provided by Bradley Lowekamp
-(https://github.com/blowekamp/itkExternalTemplate.git) which was adapted for the
-ORFEO ToolBox.
-
-Compilation des tests
-=====================
-module load cmake/3.4.3 openmpi/1.10.2 otb/develop
-cd build
-rm -rf *
-cmake -DCMAKE_CXX_FLAGS="-Wno-unused-local-typedefs -std=c++11" ..
-make
-ctest
-