Update README.md

README.md

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-# monty
+# Monty
+
+`monty` is an interpreter of Monty ByteCodes files, which is a scripting language just like Python.
+
+## About the Monty language
+This is a language that contains specific instructions to manipulate data information (stacks or queues), where each instruction (*called opcode*) is sended per line. Files which contains Monty byte codes usually have the `.m` extension.
+
+Example (`file.m`):
+```bash
+$ cat file.m
+# Pushing element to the stack
+push 0
+push 1
+push 2
+# Printing all elements
+pall
+push 3
+push 4
+pop
+# Rotating the stack to the bottom
+rotr
+pall
+rotl
+# Setting FIFO
+queue
+push 5
+# Setting LIFO
+stack
+push 5
+$
+```
+
+## Technologies
+* Interpreter was written with C language
+* C files are compiled using `gcc 4.8.4`
+* C files are written according to the C90 standard
+* Tested on Ubuntu 14.04 LTS
+
+## Usage
+To compile all files:
+
+```bash
+$ gcc -Wall -Werror -Wextra -pedantic *.c -o monty
+$
+```
+
+The **synopsis** of the interpreter is the following:
+
+```bash
+$ ./monty [filename]
+$
+```
+
+To run the interpreter:
+
+```bash
+$ ./monty file.m
+2
+1
+0
+0
+3
+2
+1
+$
+```
+
+## Features
+### Opcodes
+`monty` executes the following opcodes:
+
+| Opcode | Description |
+| -------- | ----------- |
+| `push` | Pushes an element to the stack |
+| `pall` | Prints all the values on the stack |
+| `pint` | Prints the value at the top of the stack |
+| `pop` | Removes the top element of the stack |
+| `swap` | Swaps the top two elements of the stack |
+| `queue` | Sets the format of the data to a queue (FIFO) |
+| `stack` | Sets the format of the data to a stack (LIFO) |
+| `nop` | Doesn't do anything |
+| `add` | Adds the top two elements of the stack |
+| `sub` | Subtracts the top element of the stack from the second top element of the stack |
+| `mul` | Multiplies the second top element of the stack with the top element of the stack |
+| `div` | Divides the second top element of the stack by the top element of the stack |
+| `mod` | Computes the rest of the division of the second top element of the stack by the top element of the stack |
+| `pchar` | Prints the char at the top of the stack |
+| `pstr` | Prints the string starting at the top of the stack |
+| `rotl` | Rotates the stack to the top |
+| `rotr` | Rotates the stack to the bottom |
+
+Comments, indicated with `#`, are not executed by the interpreter.
+
+When a **nonextistent opcode** is passed, the interpreter prints an error message and stops:
+
+```bash
+$ cat errorfile.m
+push 1
+pint
+pcx
+$ ./monty errorfile.m
+1
+L3: unknown instruction pcx
+```
+
+### Return value
+When there is no errors, `monty` returns `0`. Otherwise, returns `1`
+
+## Authors
+* Iyamu Hope: [LinkedIn](https://linkedin.com/in/iyamuhope) - [GitHub](https://github.com/horpeazy)