Added SWP on the instruction set

README.md

@@ -17,6 +17,7 @@ It runs the file provided by ArgoC (Argo Compiler) which transform the _argo-lan
 | MUL | MUL | Pops the last two values from the stack, it multiplies then push the result |
 | DIV | DIV | Pops the last two values from the stack, it divides then push the results (value and rest) |
 | NEG | NEG | Pops the last value from the stack, it negate then push the results |
+| SWP | SWP | Pops the last two values from the stack, it swap them then push the result on the stack |
 | CMP | CMP | Peeks the last two values from the stack, then set the CMP register to one of these values: (EQUALS, LESSER, GREATER) |
 | JMP | JMP, idx | Jumps at given instruction index |
 | JEQ | JEQ, idx | Jumps at given instruction index only if the CMP flag is set to EQUALS |