adding fibonacci.rb

a fibonacci code in ruby.

code/fibonacci.rb

@@ -0,0 +1,21 @@
+#####################
+# Fibonacci in Ruby #
+#####################
+ # main fibonacci function
+def CalculateFibonacci(n)
+    if (n == 0) 
+        return 0
+    elsif (n <= 2)
+        return 1
+    else
+        return CalculateFibonacci(n - 1) + CalculateFibonacci(n - 2)
+    end
+end
+ # execution with check regarding the amount of args
+if(ARGV.length < 1)
+    puts "argument needed. term number to iterate to, with 0 as the first term number"
+else
+    for arg in ARGV
+        puts arg.to_s + ": " + CalculateFibonacci(arg).to_s
+    end
+end