Enhance docs related to config. Includes writing docstring for __init__.

Author: pekkaklarck

README.rst

@@ -79,11 +79,12 @@ Configuration
 The remote server accepts following configuration parameters:
 
     ==============  ================  ========================================
-       Argument        Default                   Explanation
+       Argument       Default value               Explanation
     ==============  ================  ========================================
+    ``library``                       Test library instance or module to host. Mandatory argument.
     ``host``         ``'127.0.0.1'``  Address to listen. Use ``'0.0.0.0'`` to listen to all available interfaces.
     ``port``         ``8270``         Port to listen. Use ``0`` to select a free port automatically.
-    ``port_file``    ``None``         File to write port that is used.
+    ``port_file``    ``None``         File to write port that is used. ``None`` means file is not written.
     ``allow_stop``   ``True``         Allow/disallow stopping the server using ``Stop Remote Server`` keyword.
     ==============  ================  ========================================
 

src/robotremoteserver.py

@@ -44,6 +44,18 @@ class RobotRemoteServer(SimpleXMLRPCServer):
 
     def __init__(self, library, host='127.0.0.1', port=8270, port_file=None,
                  allow_stop=True):
+        """Configure and start-up remote server.
+
+        :param library:     Test library instance or module to host.
+        :param host:        Address to listen. Use ``'0.0.0.0'`` to listen
+                            to all available interfaces.
+        :param port:        Port to listen. Use ``0`` to select a free port
+                            automatically.
+        :param port_file:   File to write port that is used. ``None`` means
+                            file is not written.
+        :param allow_stop:  Allow/disallow stopping the server using
+                            ``Stop Remote Server`` keyword.
+        """
         SimpleXMLRPCServer.__init__(self, (host, int(port)), logRequests=False)
         self._library = library
         self._allow_stop = allow_stop