feat:add without plus java solution

lcci/17.01.Add Without Plus/README.md

@@ -34,7 +34,18 @@
 <!-- 这里可写当前语言的特殊实现逻辑 -->
 
 ```java
-
+class Solution {
+    public int add(int a, int b) {
+        int sum = 0, carry = 0;
+        while (b != 0) {
+            sum = a ^ b;
+            carry = (a & b) << 1;
+            a = sum;
+            b = carry;
+        }
+        return a;
+    }
+}
 ```
 
 ### ...

lcci/17.01.Add Without Plus/README_EN.md

@@ -45,7 +45,18 @@
 ### Java
 
 ```java
-
+class Solution {
+    public int add(int a, int b) {
+        int sum = 0, carry = 0;
+        while (b != 0) {
+            sum = a ^ b;
+            carry = (a & b) << 1;
+            a = sum;
+            b = carry;
+        }
+        return a;
+    }
+}
 ```
 
 ### ...

lcci/17.01.Add Without Plus/Solution.java

@@ -0,0 +1,12 @@
+class Solution {
+    public int add(int a, int b) {
+        int sum = 0, carry = 0;
+        while (b != 0) {
+            sum = a ^ b;
+            carry = (a & b) << 1;
+            a = sum;
+            b = carry;
+        }
+        return a;
+    }
+}