Adding Comment Management Exception

Handle the Exceptions of Comment Management.

components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/exception/CommentManagementException.java

@@ -0,0 +1,29 @@
+package org.wso2.carbon.device.application.mgt.common.exception;
+
+import org.wso2.carbon.device.application.mgt.common.Comment;
+
+public class CommentManagementException extends Exception{
+    private String message;
+
+    public CommentManagementException(String message, Throwable throwable) {
+        super(message, throwable);
+        setMessage(message);
+    }
+
+    public CommentManagementException(String message) {
+        super(message);
+        setMessage(message);
+    }
+
+    public CommentManagementException() {
+
+    }
+    @Override
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+}