feat: add php solution to lc problem: No.0769 (doocs#957)

Author: Qiu-IT

solution/0700-0799/0796.Rotate String/README.md

@@ -104,6 +104,21 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @param String $goal
+     * @return Boolean
+     */
+    function rotateString($s, $goal) {
+        return strlen($goal) === strlen($s) && strpos(($s.$s), $goal) !== false;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0700-0799/0796.Rotate String/README_EN.md

@@ -87,6 +87,21 @@ impl Solution {
 }
 ```
 
+### **PHP**
+
+```php
+class Solution {
+    /**
+     * @param String $s
+     * @param String $goal
+     * @return Boolean
+     */
+    function rotateString($s, $goal) {
+        return strlen($goal) === strlen($s) && strpos(($s.$s), $goal) !== false;
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0700-0799/0796.Rotate String/Solution.php

@@ -0,0 +1,10 @@
+class Solution {
+    /**
+     * @param String $s
+     * @param String $goal
+     * @return Boolean
+     */
+    function rotateString($s, $goal) {
+        return strlen($goal) === strlen($s) && strpos(($s.$s), $goal) !== false;
+    }
+}