Update README.md and guess-number-game.sh added

Author: lucsaito

README.md

@@ -11,3 +11,6 @@ A collection of simple bash scripts.
 ## Functions
 1. [What day is today?](scripts/what-day-today.sh): It prints which day of the week is today
 2. [Square a number](scripts/squarenumber.sh): A simple function that squares an integer
+
+## $RANDOM
+1. [Guess number](scripts/guess-number-game.sh): User should guess a number from 1 to 100

scripts/guess-number-game.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+# Lucas Saito, 2020/04/08
+# Simple game to guess a number from 1 to 100
+# The person has 5 tries to guess the number
+
+
+RANDOM_NUMBER=$(( $RANDOM % 100 + 1 ))
+TRIES=5
+GUESS=0
+
+echo "Welcome to the guessing game!"
+echo "Guess a number from 1 to 100:"
+
+while [[ GUESS -lt  TRIES ]]; do
+	read guess_number
+	if [[ guess_number -eq RANDOM_NUMBER ]]; then
+		echo "You've won! The number was $RANDOM_NUMBER"
+		exit 0
+	else
+		TRIES=$((TRIES - 1))
+		echo "You miss! You have ${TRIES} tries left!"
+	fi
+done
+echo "You lost!"
+exit 0