Write a function toRoman(number)
, which accepts number parameter and returns its representation in roman numerals
1 ➔ I
2 ➔ II
3 ➔ III
4 ➔ IV
5 ➔ V
9 ➔ IX
21 ➔ XXI
50 ➔ L
100 ➔ C
500 ➔ D
1000 ➔ M
I 1
V 5
X 10
L 50
C 100
D 500
M 1000