Update README.md

README.md

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 Satellite Tracking Toolkit
+=========
 
-Required libraries:
-qfits-5.2.0: ftp://ftp.eso.org/pub/qfits/qfits-5.2.0.tar.gz
-pgplot-5.2.2: http://www.astro.caltech.edu/~tjp/pgplot/
-gsl-1.15: ftp://ftp.gnu.org/gnu/gsl/gsl-1.15.tar.gz 
-wcslib-2.9
+Sattools is a collection of tools to facilitate Photographic and Video satellite tracking.
 
-Required environment variables: 
-ST_COSPAR: COSPAR number 
-ST_DATADIR: path to sattools directory 
-ST_TLEDIR: path to TLE directory
+Build
+------
+* Clone locally the code repository
+* Install common dependencies
+  * gfortran
+  * gcc
+  * libpng-dev
+  * libx11-dev
+  * libjpeg-dev 
+  * libexif-dev
+* Build & install required libraries
+  * qfits-5.2.0: ftp://ftp.eso.org/pub/qfits/qfits-5.2.0.tar.gz
+  * pgplot-5.2.2: http://www.astro.caltech.edu/~tjp/pgplot/
+  * gsl-1.15: ftp://ftp.gnu.org/gnu/gsl/gsl-1.15.tar.gz 
+  * wcslib-2.9: http://www.epta.eu.org/~bassa/wcslib-2.9.tar
+* Run `make` on the sattools folder
+
+Run
+-----
+You will need to set the following environment variables to run sattools:
+* `ST_COSPAR` COSPAR number 
+* `ST_DATADIR` path to sattools directory 
+* `ST_TLEDIR` path to TLE directory