Updated the README

README.md

@@ -1,5 +1,51 @@
 c_synth
 ============
 
-Simple chiptune-ish synthesizer written in C.
-Currently, there's only a backend for SDL2.
+c_synth is a chiptune-ish software synthesizer. It takes a MML (actually a
+language based on MML) song as input and compiles it into the memory. The
+compiled buffer may then be played through whichever backend is desired, as long
+as it accepts samples in little endian and use either 16 or 8 bits samples.
+
+## Compiling and installing
+
+All the following steps where also tested on Windows, using
+[MinGW](http://www.mingw.org/).
+
+There are no dependencies to build the library. After cloning it, simply run:
+
+```
+$ sudo make install
+```
+
+The library will be installed on /usr/lib/c_synth and the headers on
+/usr/include/c_synth.
+
+## Testing and running
+
+There are a few songs on the directory 'samples/'. They may be compiled and
+played using the examples on the directory 'tst/'.
+
+Some tests uses SDL2 to actually play the compiled songs. On debian-based
+distros, that library may be installed by running:
+
+```
+$ sudo apt-get install libsdl2-dev
+```
+
+For other linux distros, look into your package manager or download the
+[source](https://www.libsdl.org/download-2.0.php) and compile it manually.
+
+To build the tests, run:
+
+```
+$ make tests
+```
+
+To play one of the songs:
+
+```
+./bin/Linux/tst_repeatSongSDL2 --frequency 44100 --mode 2chan-16 --file samples/sonic2-chemical.mml
+```
+
+To exit, press Ctrl-C.
+