better readme

README

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-To launch the application, run
-
-./relational_gui.py
-
-Language definition is here:
-https://github.com/ltworf/relational/wiki/Grammar-and-language
-
-If it needs some dependencies:
-Qt4, Python 2.7, either PyQT4 or Pyside.
-

README.md

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+Relational an educational tool to provide a workspace for experimenting with *relational* *algebra*, an offshoot of first-order logic.
+
+It provides GUI that can be used for executing relational queries, and also provides a command line interface.
+
+Provides a standalone Python module that can be used for executing relational queries, parsing relational expressions and optimizing them.
+
+Install
+=======
+
+Windows installer can be found here: https://code.google.com/p/relational/downloads/list
+
+For Linux, check your distribution's packages, relational is available on Debian and Ubuntu.
+
+
+Usage
+=====
+
+Formal language definition at this link https://github.com/ltworf/relational/wiki/Grammar-and-language
+
+
+
+Run from sources
+================
+
+
+To launch the application, run
+
+```./relational_gui.py```
+
+If it needs some dependencies:
+Qt4, Python 2.7, either PyQT4 or Pyside.
+
+It can run on osx but this is not supported.
+