merge: added Problem 25 to Euler (#793)

* added Problem 25

* fixed alert

* fixed alert

* rewrote to improve runtime

* Update Problem025.js

* fixed typo

* added test file for Project-Euler/Problem025.js

* Update Project-Euler/test/Problem025.test.js

Co-authored-by: Rak Laptudirm <raklaptudirm@gmail.com>

* Update Problem025.test.js

Co-authored-by: Rak Laptudirm <raklaptudirm@gmail.com>

Project-Euler/test/Problem025.test.js

@@ -0,0 +1,27 @@
+import { fibonacciIndex } from '../Problem025'
+
+describe ('Check Problem 25 - 1000 digit Fibonnaci number', () => {
+    it('First term of the Fibonnaci sequence containing 3 digits', () => {
+        expect(fibonacciIndex(3)).toBe(12)
+    })
+
+    it('First term of the Fibonnaci sequence containing 10 digits', () => {
+        expect(fibonacciIndex(10)).toBe(45)
+    })
+
+    it('First term of the Fibonnaci sequence containing 50 digits', () => {
+        expect(fibonacciIndex(50)).toBe(237)
+    })
+
+    it('First term of the Fibonnaci sequence containing 100 digits', () => {
+        expect(fibonacciIndex(100)).toBe(476)
+    })
+
+    it('First term of the Fibonnaci sequence containing 1000 digits', () => {
+        expect(fibonacciIndex(1000)).toBe(4782)
+    })
+    
+    it('First term of the Fibonnaci sequence containing 10000 digits', () => {
+        expect(fibonacciIndex(10000)).toBe(47847)
+    })
+})