Add Algorithms to Math with tests (#429)

* chore: add area and area test

* chore: add armstrong number

* chore: add factors

* chore: add perfect cube

* chore: add perfect square

* chore: add perfect number

* chore: add number of digits

* chore: fix according to standardjs

* chore: remove conflicting files

Maths/test/ArmstrongNumber.test.js

@@ -0,0 +1,14 @@
+import { armstrongNumber } from '../ArmstrongNumber'
+
+describe('ArmstrongNumber', () => {
+  it('should return true for an armstrong number', () => {
+    expect(armstrongNumber(371)).toBeTruthy()
+  })
+
+  it('should return false for a non-armstrong number', () => {
+    expect(armstrongNumber(300)).toBeFalsy()
+  })
+  it('should return false for negative values', () => {
+    expect(armstrongNumber(-2)).toBeFalsy()
+  })
+})