Move docs/README.md to root

Also:
* consolidated the info in the previous rdc/README.md into
the README.md that was moved from docs/ directory.
* added missing information to get grpc into the default
library path (needed to add the grpc dir with ldconfig).
* formatting fixes

Change-Id: Id61e761ad7bdee40364bb8837be8705ed5ca53d1

client/CMakeLists.txt

@@ -195,7 +195,7 @@ if (DOXYGEN_FOUND AND LATEX_FOUND)
   install(FILES ${CMAKE_CURRENT_BINARY_DIR}/latex/refman.pdf
    DESTINATION ${RDC_CLIENT_INSTALL_PREFIX}/${RDC}/docs/${RDC_MANUAL_NAME}.pdf
                 COMPONENT ${CLIENT_COMPONENT})
-  install(FILES ${PROJECT_SOURCE_DIR}/docs/README.md
+  install(FILES ${PROJECT_SOURCE_DIR}/README.md
                        DESTINATION  ${RDC_CLIENT_INSTALL_PREFIX}/${RDC}/docs/
                           COMPONENT ${CLIENT_COMPONENT})
 else()