Add Readme for the basic e2e test

basice2e/README.md

+= Basic End-to-End Integration Test (basice2e)
+
+This test runs several servers and clients as a smoke test against the
+system. We runs a multi node, multi message, multi user test of the
+system over multiple rounds all over network traffic. The basic
+structure is as follows:
+
+* 5 Nodes, BatchSize of 12
+* 3 Clients, each send 4 messages over several rounds:
+** 2 messages to itself
+** 1 message to each of the other nodes
+* Each client asserts they receive their predefined messages
+
+For now, we do nothing on assertion of crypto, we just assume
+api-level compliance with sending and receiving messages.