feat: add kotlin solution to lc problem: No.1672 (doocs#830)

No.1672. Richest Customer Wealth

Author: Itsydv

solution/1600-1699/1672.Richest Customer Wealth/README.md

@@ -146,6 +146,23 @@ impl Solution {
 }
 ```
 
+### **Kotlin**
+
+```kotlin
+class Solution {
+    fun maximumWealth(accounts: Array<IntArray>): Int {
+        var max = 0
+        for (account in accounts) {
+            val sum = account.sum()
+            if (sum > max) {
+                max = sum
+            }
+        }
+        return max
+    }   
+}
+```
+
 ### **...**
 
 ```

solution/1600-1699/1672.Richest Customer Wealth/README_EN.md

@@ -139,6 +139,23 @@ impl Solution {
 }
 ```
 
+### **Kotlin**
+
+```kotlin
+class Solution {
+    fun maximumWealth(accounts: Array<IntArray>): Int {
+        var max = 0
+        for (account in accounts) {
+            val sum = account.sum()
+            if (sum > max) {
+                max = sum
+            }
+        }
+        return max
+    }   
+}
+```
+
 ### **...**
 
 ```

solution/1600-1699/1672.Richest Customer Wealth/Solution.kt

@@ -0,0 +1,12 @@
+class Solution {
+    fun maximumWealth(accounts: Array<IntArray>): Int {
+        var max = 0
+        for (account in accounts) {
+            val sum = account.sum()
+            if (sum > max) {
+                max = sum
+            }
+        }
+        return max
+    }   
+}