feat: add typescript solution to locf problem: No.10- I. Fib (doocs#426)

Author: zhaocchen

lcof/面试题10- I. 斐波那契数列/README.md

@@ -112,6 +112,19 @@ func fib(n int) int {
 }
 ```
 
+### **TypeScript**
+
+```ts
+function fib(n: number): number {
+    let a: number = 0, b: number = 1;
+    for (let i: number = 0; i < n; i++) {
+        let c: number = (a + b) % 1000000007;
+        [a, b] = [b, c];
+    }
+    return a;
+};
+```
+
 ### **...**
 
 ```

lcof/面试题10- I. 斐波那契数列/Solution.ts

@@ -0,0 +1,8 @@
+function fib(n: number): number {
+    let a: number = 0, b: number = 1;
+    for (let i: number = 0; i < n; i++) {
+        let c: number = (a + b) % 1000000007;
+        [a, b] = [b, c];
+    }
+    return a;
+};