Update README.md with feature documentation. (#102)

Signed-off-by: Michel Hidalgo <michel@ekumenlabs.com>
ros2 · May 8, 2020 · d546203 · d546203
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 # rmw_implementation
 
-Implementation of ROS middleware functions used in C++.
+Proxy implementation of the ROS 2 Middleware Interface, forwarding calls to the chosen (and dynamically loaded) `rmw` implementation.
+`RMW_IMPLEMENTATION` environment variable, if set, allows the user to select one of the available `rmw` implementations.
+Otherwise, the default `rmw` implementation will be used.
+Refer to `rmw_implementation_cmake` package to learn about this default.
+
 
 ## Quality Declaration