添加（0860.柠檬水找零.md）：增加typescript版本

problems/0860.柠檬水找零.md

@@ -254,5 +254,39 @@ var lemonadeChange = function(bills) {
 
 ```
 
+### TypeScript
+
+```typescript
+function lemonadeChange(bills: number[]): boolean {
+    let five: number = 0,
+        ten: number = 0;
+    for (let bill of bills) {
+        switch (bill) {
+            case 5:
+                five++;
+                break;
+            case 10:
+                if (five < 1) return false;
+                five--;
+                ten++
+                break;
+            case 20:
+                if (ten > 0 && five > 0) {
+                    five--;
+                    ten--;
+                } else if (five > 2) {
+                    five -= 3;
+                } else {
+                    return false;
+                }
+                break;
+        }
+    }
+    return true;
+};
+```
+
+
+
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