feat:encoder with existing lib (#2)

Co-authored-by: Clement <c.boesmier@aptatio.com>
Reviewed-on: #2

lib/Encoder/Encoder.cpp

@@ -0,0 +1,10 @@
+
+#include "Encoder.h"
+
+// Yes, all the code is in the header file, to provide the user
+// configure options with #define (before they include it), and
+// to facilitate some crafty optimizations!
+
+Encoder_internal_state_t * Encoder::interruptArgs[];
+
+