README.rst: Adding initial version of a rst based README (only introduction and build information).

README.rst

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+JACK2
+#####
+
+https://travis-ci.org/jackaudio/jack2.svg?branch=master
+
+JACK2 aka jackdmp is a C++ version of the JACK low-latency audio server for
+multi-processor machines. It is a new implementation of the JACK server core
+features that aims in removing some limitations of the JACK1 design. The
+activation system has been changed for a data flow model and lock-free
+programming techniques for graph access have been used to have a more dynamic
+and robust system.
+
+- jackdmp uses a new client activation model, that allows simultaneous client
+  execution (on a SMP machine) when parallel clients exist in the graph (client
+  that have the same inputs). This activation model allows to better use
+  available CPU on a smp machine, but also works on mono-processor machine.
+
+- jackdmp uses a lock-free way to access (read/write) the client graph, thus
+  allowing connections/disconnection to be done without interrupting the audio
+  stream. The result is that connections/disconnections are glitch-free.
+
+- jackdmp can work in two different modes at the server level:
+  - synchronous activation : in a given cycle, the server waits for all clients
+    to be finished (similar to normal jackd)
+  - asynchronous activation : in a given cycle, the server does not wait for
+    all clients to be finished and use output buffer computed the previous
+    cycle.
+    The audible result of this mode is that if a client is not activated during
+    one cycle, other clients may still run and the resulting audio stream will
+    still be produced (even if its partial in some way). This mode usually
+    result in fewer (less audible) audio glitches in a loaded system.
+