Add an example file which creates an RDMA device, allocates a Memory Region
and prepares a Queue Pair for a client to read the MR.

Create two functions which can be called from the outside to exchange RDMA informations using UDP.
The example files now refer to these functions.

- Use a bin/ directory for output
- Define `make all` as the default recipe

Before starting a RDMA communication between two nodes, local
informations must be exchanged. The proposed example uses UDP
for that purpose.