Added instruction table

README.md

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+# Argo
+
+ArgoVM is a stack-based virtual machine similar to JVM. 
+
+It runs the file provided by ArgoC (Argo Compiler) which transform the _argo-lang_ into an executable byte-code format.
+
+### Instruction Set
+
+
+
+| OP | Usage | Function |
+|-------|---------------|--------------------------------------------------------------------------------------------|
+| HLT | HLT | Terminate the program |
+| NOP | NOP | Nothing |
+| PSH | PSH, \<value> | Pushes \<value> on the stack |
+| POP | POP | Pops value from stack |
+| ADD | ADD | Pops the last two values from the stack, it sums then push the result |
+| SUB | SUB | Pops the last two values from the stack, it subtracts then push the result |
+| 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) |
+| CMP | CMP | Peeks the last two values from the stack then compare. (EQUALS, LESSER, GREATER) |
+| JMP | JMP, \<idx> | Jumps at given instruction index |
+| JME | JME, \<idx> | Jumps at given instruction index only if the CMP flag is set to EQUALS |
+| JMN | JMN, \<idx> | Jumps at given instruction index only if the CMP flag is NOT set to EQUALS |
+| JMG | JMG, \<idx> | Jumps at given instruction index only if the CMP flag is set to GREATER |
+| JML | JML, \<idx> | Jumps at given instruction index only if the CMP flag is set to LESSER |
+| JEG | JEG, \<idx> | Jumps at given instruction index only if the CMP flag is set to EQUALS or GREATER |
+| JEL | JEL, \<idx> | Jumps at given instruction index only if the CMP flag is set to EQUALS or LESSER |
+| CLL | CLL, \<idx> | Executes the given routine identifier |
+| RET | RET | Routine specific instruction, it's used to terminate the current routine flow |
+| PRINT | PRINT | Peeks the last value from the stack and print it. |