README installation and example usage

Author: cpcloud

README.md

@@ -1,2 +1,35 @@
 # ipython-autotime
 Time everything in IPython
+
+## Installation:
+
+```
+%install_ext https://raw.github.com/cpcloud/ipython-autotime/master/autotime.py
+```
+
+## Examples
+
+```python
+In [1]: %install_ext https://raw.github.com/cpcloud/ipython-autotime/master/autotime.py
+Installed autotime.py. To use it, type:
+  %load_ext autotime
+
+In [2]: %load_ext autotime
+time: 1433692.87 s
+
+In [3]: x = 1
+time: 730.99 us
+
+In [4]: x + 2
+Out[4]: 3
+time: 2.50 ms
+
+In [5]: x + ''
+---------------------------------------------------------------------------
+TypeError                                 Traceback (most recent call last)
+<ipython-input-5-bde712cacec5> in <module>()
+----> 1 x + ''
+
+TypeError: unsupported operand type(s) for +: 'int' and 'str'
+time: 156.05 ms
+```