It adds an example of usage from python

README.md

@@ -68,7 +68,9 @@ In both cases these folder locations point to the **parent** folder of the datas
 
 MetadataManager has got as **optional** dependency graypy (https://pypi.python.org/pypi/graypy) and requests
 
-It can be installed:
+Requests is a requirement for sending notifications to the **elogbook** and graypy is required to use **Graylog**
+
+They can be installed:
 ```
 easy_install graypy
 easy_install requests
@@ -292,6 +294,88 @@ Select the files and follow the instruccions
 
 Go the the requirements section where dependencies are explained: [Requirements](#requirements)
 
+### Usage
+
+#### Python
+
+Example:
+```
+#!/usr/bin/env python
+
+"""A simple client for MetadataManager and MetaExperiment
+"""
+import time
+import os
+import sys
+import logging
+import PyTango.client
+from time import gmtime, strftime
+
+class MetadataManagerClient(object):
+
+    metadataManager = None
+    metaExperiment = None
+
+    """
+    A client for the MetadataManager and MetaExperiment tango Devices
+
+    Attributes:
+        name: name of the tango device. Example: 'id21/metadata/ingest'
+    """
+    def __init__(self, metadataManagerName, metaExperimentName):
+        """
+    	Return a MetadataManagerClient object whose metadataManagerName is *metadataManagerName*
+    	and metaExperimentName is *metaExperimentName*
+    	"""
+        
+        self.proposal = None                
+    	if metadataManagerName:
+            self.metadataManagerName = metadataManagerName
+        if metaExperimentName:
+    		self.metaExperimentName = metaExperimentName
+
+        print('MetadataManager: %s' % metadataManagerName)
+        print('MetaExperiment: %s' % metaExperimentName)
+
+       	""" Tango Devices instances """	 
+        try:
+            MetadataManagerClient.metadataManager = PyTango.client.Device(self.metadataManagerName)
+            MetadataManagerClient.metaExperiment = PyTango.client.Device(self.metaExperimentName)
+        except:
+            print "Unexpected error:", sys.exc_info()[0]
+            raise
+
+
+    ''' Set proposal should be done before stting the data root '''
+    def setProposal(self, proposal):
+        try:
+            MetadataManagerClient.metaExperiment.proposal = proposal
+            self.proposal = proposal
+        except:
+            print "Unexpected error:", sys.exc_info()[0]
+            raise
+  
+    def notifyInfo(self, message):
+        MetadataManagerClient.metadataManager.notifyInfo(message)
+
+    def notifyError(self, message):
+        MetadataManagerClient.metadataManager.notifyError(message)
+
+    def notifyDebug(self, message):
+        MetadataManagerClient.metadataManager.notifyDebug(message)
+
+if __name__ == '__main__':
+    metadataManagerName = 'id00/metadata/mgr'
+    metaExperimentName  = 'id00/metadata/exp'
+    client = MetadataManagerClient(metadataManagerName, metaExperimentName)
+                   
+    client.setProposal('ID000000') 
+    client.notifyInfo("This is a info") 
+    client.notifyError("This is a error")
+    client.notifyDebug("This is debug")
+
+
+```