Add C-project for simulating axis in commandline

before adding the travelMm function the algorithm for moving the
axis between left and right was designed and evaluated via commandline
first.

-> Add this test-code in this commit

testing/cnc-guide/makefile

@@ -0,0 +1,7 @@
+default: program
+
+program:
+	gcc main.c -o a.out -lm
+
+clean:
+	-rm -f a.out