update README

README.md

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 # web-galaxy
 A minimalist web framework for the Racket web-server
+
+## Installation
+
+The library is in a **very early stage of development**, but is already used in most of my web projects and available in the Racket package repository:
+
+```
+raco pkg install web-galaxy
+```
+
+## Example
+
+You can find a very simple blog written with `web-galaxy` in the [test folder](https://github.com/euhmeuh/web-galaxy/tree/master/web-galaxy-test/tests/web-galaxy/pony-blog).
+
+## Features
+
+`web-galaxy` is heavily based on the standard Racket `web-server` library.
+It provides simple tools for building a web site that `web-server` does not provide but are pretty much always required in web projects:
+- a **translation** system based on the Scheme standard SRFI 29
+- a **date** system based on the Scheme standard SRFI 19
+- a simple HTML page generator based on s-expressions
+- a component system for HTML elements (called **entities**)
+- a preconfigured **logging** system
+- a preconfigured server so that you don't have to know every inner-workings of the Racket `web-server`, configurable step by step using parameters
+
+The aim of this library is to stay as simple and light as possible by using Scheme standards and basic Racket libraries, but still provide an easy "all-in-one" package to start developing web sites in Racket.