Update readme

README.md

@@ -0,0 +1,54 @@
+# pdfsearch #
+
+**pdfsearch** finds text strings inside a pdf.
+
+## Installation ##
+
+```sh
+pip install PyPDF2
+pip install tqdm
+```
+
+Then
+
+```sh
+git clone http://git.wrl.unsw.edu.au:3000/danh/pdfsearch.git
+cd pdfsearch
+python setup.py install
+```
+
+Or put a copy of `pdfsearch.py` in your working directory.
+
+## Usage ##
+
+```python
+>>> from pdfsearch import search_pdf
+
+>>> pdf_name = 'animal-farm.pdf'
+>>> search_patterns = ['horse', 'pig']
+>>> context_length = 2
+>>> results = search_pdf(pdf_name, search_patterns, context_length)
+
+>>> pd.DataFrame(results)
+
+document         page   pattern  word          context
+--------------------------------------------------------------------------
+animal-farm.pdf     1   horse    cart-horses,  The two cart-horses, Boxer
+animal-farm.pdf     1   horse    horses        two ordinary horses put together.
+animal-farm.pdf     1   horse    horses        the horses came
+animal-farm.pdf     1   pig      pig,          a majestic-looking pig, with a
+animal-farm.pdf     1   pig      pigs,         the pigs, who
+animal-farm.pdf     1   pig      pigeons       window-sills, the pigeons fluttered up
+animal-farm.pdf     1   pig      pigs          the pigs and began
+animal-farm.pdf     2   horse    horses        The two horses had just
+```
+
+Search patterns should be lowercase, unless case-sensitivity is important. For example:
+
+`'ph'` will match:
+   - `'photograph'`
+   - `'PHANTOM'`
+   - `'pH'`
+
+`'pH'` will match:
+   - `'pH'`