Initial data commit

Task/Fibonacci-sequence/Mirah/fibonacci-sequence.mirah

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+def fibonacci(n:int)
+    return n if n < 2
+    fibPrev = 1
+    fib = 1
+    3.upto(Math.abs(n)) do
+        oldFib = fib
+        fib = fib + fibPrev
+        fibPrev = oldFib
+    end
+    fib * (n<0 ? int(Math.pow(n+1, -1)) : 1)
+end
+
+puts fibonacci 1
+puts fibonacci 2
+puts fibonacci 3
+puts fibonacci 4
+puts fibonacci 5
+puts fibonacci 6
+puts fibonacci 7