Update readme

README.md

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 # photo-to-kml #
 
-photo-to-kml creates a kml file that shows geotagged images in Google Earth.
+__photo-to-kml__ creates a kml file that shows geotagged images in Google Earth.
+
+![Images shwon in Google Earth](doc/google-earth.jpg)
+
+## Installation ##
+
+`pip install simplekml`
+
+## Usage ##
+
+Create a kml for a folder of photos, named 'image_folder':
+
+`python photo_to_kml.py image_folder`