Changing README with the new logo

Author: kevinsala

README.md

@@ -1,17 +1,4 @@
-# Task-Aware MPI Library
-
-:warning: **IMPORTANT:** :warning: The current library (TAMPI-OPT) implements significant
-optimizations. Some features have been dropped and some others are not supported yet. The
-following changes apply:
-
-* The library does not support request-based MPI operations. The following functions are no
-  longer implemented: `MPI_Wait`, `MPI_Waitall`, `TAMPI_Iwait`, `TAMPI_Iwaitall`. Instead, the
-  application should use blocking operations like `MPI_Recv` or `MPI_Send`, or the TAMPI
-  non-blocking variants like `TAMPI_Isend` or `TAMPI_Irecv`, which do not provide a request.
-  Check these TAMPI variants in `src/include/TAMPI_Wrappers.h`.
-* All point-to-point and collective operations are supported except for `MPI_Sendrecv` and
-  `MPI_Sendrecv_replace`.
-* Fortran applications are not supported for the moment.
+![TAMPI Logo](docs/fig/logo.png)
 
 The Task-Aware MPI or TAMPI library extends the functionality of standard MPI libraries
 by providing new mechanisms for improving the interoperability between parallel task-based
@@ -47,6 +34,30 @@ On the other hand, TAMPI is compatible with mainstream MPI implementations that
 features. The following sections describe in detail the blocking (OmpSs-2) and non-blocking
 (OpenMP & OmpSs-2) modes of TAMPI.
 
+
+## Important Notice
+
+The current library implements significant optimizations using a delegation technique. All the
+communications are delegated to a polling task, so the MPI interface is mostly accessed by this
+task. By delegating communications, we avoid threading contention at the MPI layer and obtain
+the MPI performance of single-threaded scenarios. Furthermore, another polling task handles the
+post-processing of tickets and calls the tasking runtime system. We call TAMPI-OPT to this
+optimized library.
+
+We have dropped some features and others are not supported yet in TAMPI-OPT. The following
+changes apply:
+
+* TAMPI-OPT does not support request-based MPI operations. The following functions are no
+  longer implemented: `MPI_Wait`, `MPI_Waitall`, `TAMPI_Iwait`, `TAMPI_Iwaitall`. Please use
+  use blocking operations (e.g., `MPI_Recv`, `MPI_Send`) or non-blocking TAMPI operations
+  (e.g., `TAMPI_Isend`, `TAMPI_Irecv`). These latter do not provide a request and are the
+  recommended for performance. Check these variants in `src/include/TAMPI_Wrappers.h`.
+* All point-to-point and collective operations are supported, except `MPI_Sendrecv` and
+  `MPI_Sendrecv_replace`.
+* Fortran applications are not supported.
+* The documentation in the following sections may be outdated.
+
+
 ## Blocking Mode (OmpSs-2)
 
 The blocking mode of TAMPI targets the safe and efficient execution of blocking MPI operations