add demos to readme

README.md

@@ -1,2 +1,68 @@
 # pyvenn
 2 ~ 6 Sets Venn Diagram For Python
+
+Use magic function in ipython notebook:
+```python
+%matplotlib inline
+
+import venn
+```
+
+Or using non-interactive backend:
+```python
+import matplotlib
+matplotlib.use('Agg')
+
+import venn
+```
+
+Fetch labels of each subset in venn diagram. The input data is an array of iterable data(list, set, etc.). 
+```python
+In [5]: labels = venn.get_labels([
+            range(10),
+            range(5, 15)
+        ], fill=['number', 'logic'])
+In [6]: print labels
+Out [6]: {'01': '01: 5', '10': '10: 5', '11': '11: 5'}
+```
+
+And plot:
+```python
+fig, ax = venn.venn2(labels, names=['list 1', 'list 2'])
+fig.show()
+```
+
+![venn2](https://raw.githubusercontent.com/wiki/tctianchi/pyvenn/venn2.png)
+
+More examples:
+```python
+labels = venn.get_labels([range(10), range(5, 15), range(3, 8)], fill=['number', 'logic'])
+fig, ax = venn.venn3(labels, names=['list 1', 'list 2', 'list 3'])
+fig.show()
+```
+
+![venn3](https://raw.githubusercontent.com/wiki/tctianchi/pyvenn/venn3.png)
+
+```python
+labels = venn.get_labels([range(10), range(5, 15), range(3, 8), range(8, 17)], fill=['number', 'logic'])
+fig, ax = venn.venn4(labels, names=['list 1', 'list 2', 'list 3', 'list 4'])
+fig.show()
+```
+
+![venn4](https://raw.githubusercontent.com/wiki/tctianchi/pyvenn/venn4.png)
+
+```python
+labels = venn.get_labels([range(10), range(5, 15), range(3, 8), range(8, 17), range(10, 20)], fill=['number', 'logic'])
+fig, ax = venn.venn5(labels, names=['list 1', 'list 2', 'list 3', 'list 4', 'list 5'])
+fig.show()
+```
+
+![venn5](https://raw.githubusercontent.com/wiki/tctianchi/pyvenn/venn5.png)
+
+```python
+labels = venn.get_labels([range(10), range(5, 15), range(3, 8), range(8, 17), range(10, 20), range(13, 25)], fill=['number', 'logic'])
+fig, ax = venn.venn6(labels, names=['list 1', 'list 2', 'list 3', 'list 4', 'list 5', 'list 6'])
+fig.show()
+```
+
+![venn6](https://raw.githubusercontent.com/wiki/tctianchi/pyvenn/venn6.png)

demo.py

@@ -6,12 +6,12 @@
 # python console requires this
 import matplotlib
 matplotlib.use('Agg')
-import matplotlib.pyplot as plt
 
+import matplotlib.pyplot as plt
 import venn
 
-labels = venn.get_labels([range(10), range(5,15)], fill=['number', 'logic'])
-fig, ax = venn.venn2(labels, names=['List 1', 'List 2'])
+labels = venn.get_labels([range(10), range(5, 15)], fill=['number', 'logic'])
+fig, ax = venn.venn2(labels, names=['list 1', 'list 2'])
 fig.savefig('venn2.png', bbox_inches='tight')
 plt.close()