[doc & gitignore] add an example in the readme.md Add __pycache__ on the .gitignore

.gitignore

+__pycache__
\ No newline at end of file

README.md

 # Nanospace-client
 
 ## Python client
+### Requirement
 Request package is needed
 ```bash
 pip install requests
 ```
+
+### Simple examle
 Check simple_example.py. Before try to launch it, think to change the login, password and srvUrl in the file.
+Think to end the address with a '/'.
+```python
+from nanospace import Nanospace
+
+nanospace = Nanospace('http://yourSrvUrl/','yourUsername', 'yourPassword')
+print(nanospace.get_value(66))
+nanospace.update_value(66, 'sma', '9000000')
+print(nanospace.get_value(66)) # 9000000
+```
+
+
+### Notes 
+This is currently working only 
+
 
 ## Bash client
 ### Get your login