implemented interpreter; setup code dir; added code sync to Makefile

code/start.txt

@@ -0,0 +1,18 @@
+\a
+=result
+5
+=ctr
+:loop
+$result
+dup
+cat
+=result
+$ctr
+dec
+=ctr
+$ctr
+0
+>loop
+gne
+$result
+end