Update README with more examples and fix shell instructions

README.md

@@ -12,9 +12,16 @@ A python script for summarizing articles using nltk.
 ## Usage:
 
     git clone https://github.com/Rotten194/summarize.py.git
-    cd summarize.py
+    cd summarize.py/summarize
     ./summarize.py http://www.washingtonpost.com/blogs/the-switch/wp/2013/08/01/how-vermont-could-save-the-nation-from-patent-trolls/
 
+Usage from code:
+
+    # sudo python setup.py install
+    # then
+    import summarize
+    summarize.summarize_text(large_text)
+
 ## Python 3 Support Notes:
 
 To use NLTK with Python 3 currently, you must install the NLTK 3.0 alpha packages available at [nltk.org](http://www.nltk.org/nltk3-alpha). All other libraries required by summarize.py have Python 3 versions.