samples: cpp_synchronization: Change sample description to rst format

Rename README.txt to README.rst and change format to rst.

Signed-off-by: Joakim Andersson <[email protected]>

samples/classic.rst

@@ -12,4 +12,5 @@ platforms:
 
    hello_world/*
    synchronization/*
+   cpp_synchronization/*
    philosophers/*

samples/cpp_synchronization/README.rst

@@ -0,0 +1,60 @@
+.. _cpp_synchronization:
+
+C++ Synchronization
+###################
+
+Overview
+********
+The sample project illustrates usage of pure virtual class, member
+functions with different types of arguments, global objects constructor
+invocation.
+
+A simple application demonstrates basic sanity of the kernel.  The main thread
+and a cooperative thread take turns printing a greeting message to the console,
+and use timers and semaphores to control the rate at which messages are
+generated. This demonstrates that kernel scheduling, communication, and
+timing are operating correctly.
+
+Building and Running
+********************
+
+This kernel project outputs to the console.  It can be built and executed
+on QEMU as follows:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/cpp_synchronization
+   :host-os: unix
+   :board: qemu_x86
+   :goals: run
+   :compact:
+
+Sample Output
+=============
+
+.. code-block:: console
+
+     Create semaphore 0x001042b0
+     Create semaphore 0x001042c4
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+     coop_thread_entry: Hello World!
+     main: Hello World!
+
+     <repeats endlessly>
+
+Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.