extending usage description

README.md

@@ -24,3 +24,29 @@ Within Energia on LM4F target there are only two timers available for free use:
 - // SYSCTL_PERIPH_TIMER5, // wiring.c - millis() micros()
 - // SYSCTL_PERIPH_TIMER6,
 - // SYSCTL_PERIPH_TIMER7
+
+To sum up, both the original AccelStepper and iAccelStepper library should be located in your library folder, not neceserily in a common folder:
+${ENERGIA_PROJECT}/sketches
+${ENERGIA_PROJECT}/libraries/AccelStepper/AccelStepper.cpp
+${ENERGIA_PROJECT}/libraries/AccelStepper/AccelStepper.h
+${ENERGIA_PROJECT}/libraries/iAccelStepper/iAccelStepper.cpp
+${ENERGIA_PROJECT}/libraries/iAccelStepper/iAccelStepper.h
+
+In the main ino file one need to include both header files:
+```
+#include "AccelStepper.h"
+#include "iAccelStepper.h"
+```
+
+Instantiation of object boils down to an empty declaration:
+```
+iAccelStepper axis1;
+iAccelStepper axis2;
+```
+setup() should contain initialisation call:
+```
+axis1.begin(PB_0, PB_5);
+axis2.begin(PE_4, PB_1);
+```
+To perform any movement, the usual methods of the original AccelStepper should be used, such as move(), moveTo() and stop(). The difference is iAccelStepper _DO_NOT_REQUIRE_ call run() method. See example for more.
+