Update README.md

README.md

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-# librpitx
-Radio frequency transmitter library - Engine of rpitx
+**librpitx** Radio frequency transmitter library for Raspberry Pi (B, B+, PI2, PI3 and PI zero)
+
+It is now the base of *rpitx* project, separate from application
+
+_Copyright (c) Evariste Courjaud F5OEO. Code is GPL_V3
+
+# Installation
+Depends on https://github.com/jgaeddert/liquid-dsp/
+
+```sh
+git clone https://github.com/F5OEO/librpitx
+cd librpitx/src
+make
+```