Adding some description

Help for beginners who don't know where to start from

README.rst

@@ -28,6 +28,31 @@ Example
     client = fbchat.Client("YOUR_ID", "YOUR_PASSWORD")
 
 
+Sending a Message
+=================
+
+.. code-block:: python
+    
+    friends = client.getUsers("FRIEND'S NAME")  # return a list of names
+    friend = friends[0]
+    sent = client.send(friend.uid, "Your Message")
+    if sent:
+        print("Message sent successfully")
+
+
+Getting last messages sent
+==========================
+
+.. code-block:: python
+    
+    last_messages = client.getThreadInfo(friend.uid,0)
+    # messages come in reversed order
+    last_messages.reverse()
+    
+    for message in last_messages:
+        print(message.body)
+
+
 Authors
 =======