Update README

README.md

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 Amp Factory
 ===========
 
-Schematics for A-wai Amplification tube amplifiers
+Amp Factory is a collection of free (as in "free speech", not "free beer") electronic schematics for tube amplifiers dedicated to guitar and bass.
 
-TODO
+A-wai Amplification
+-------------------
+
+The documents in the "a-wai" directory are the schematics for amplifiers manufactured by A-wai Amplification, a one-person company building handwired amplifiers in Toulouse, France.
+
+These schematics are licensed under the terms of the version 3 of the GNU General Public License. Therefore, you are granted the right to use, modify and/or redistribute these documents under certain conditions, listed in the GNU General Public License (see LICENSE file or the GNU website at http://www.gnu.org/licenses/).
+
+The schematics are offered in two file formats :
+- a .pdf for easy viewing and printing
+- a .jsch file, which you can edit using the JSchem free software (http://dhost.info/jschem/)
+
+Contributed schematics
+----------------------
+
+The "contrib" directory holds the schematics for amplifiers not manufactured by A-wai Amplification.
+
+These schematics are the property of their respective owners, while still being offered under the terms of a free software license.
+
+In that respect, they are also provided in a printable pdf version, as well as an editable version.
+
+Non-free schematics
+-------------------
+
+Finally, the "non-free" directory holds a collection of schematics gathered from the web. These schematics are only available in printable form, and you cannot modify these files.
+
+How to contribute
+=================
+
+You can send me your schematics to :
+	info [AT] a-wai [DOTCOM]
+
+Please be aware that any contribution has to relate to an amplifier already built and proven to work as expected, and be offered under a GPL-compatible license, in both printable and editable file formats.
+
+There may be a few exceptions regarding very rare amplifiers which would present a particular interest from a technical point of view, but they must be strictly considered this way -- exceptions.