Added readme

Signed-off-by: Fabiano Riccardi <[email protected]>

README.md

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+# Melody Manager for Arduino
+A library to store and manage melody on buzzer/piezo. The melody can be stored on file and dinamically loaded in ram memory.
+
+### Details about the format
+You can write your own melody on a simple file (extension .mel), accordigly to the following format:
+
+    title={Name of the melody}
+    tempo={Base time in millisecond}
+    length={Array length}
+    format={A value between "integer" or "string", it specifies the format about frequency in array}
+    {Array composed by pair <{frequency, as integer number or as note in italian style}, {duration, in tempo unit}>}, semicolon-separated}
+Between 2 pairs there is always a small pause.
+It is very naive, it was designed to be as minimal as possible. In hindsight, I should have used the RTTTL format designed by Nokia many year ago to encode ringtones on mobile phone. This format would guarantee lots of available free melodies and a better portability among codebases. Among many good libraries supporting RTTTL on buzzer, I would point out [Non-blocking playback of RTTTL melodies
+](https://github.com/cefn/non-blocking-rtttl-arduino) and [Arduino RTTTL Player](https://github.com/ponty/arduino-rtttl-player).
+
+
+An example, it codifies two simple beep:
+
+    title=Bip
+    tempo=200
+    length=1
+    format=integer
+    3000,3