Fix: Fixing License issue in MVVM pattern (#1701)

* Fixing License issue in MVVM pattern

* Updating LICENSE.md

* Updating pom.xml

* License header update to MVVM module only.

* Updating pom and removing gpl txt

* Adding gpl txt file

Co-authored-by: Jinisha <Jinisha@LAPTOP-VG38PNMC.fios-router.home>

model-view-viewmodel/src/test/java/com/iluwatar/model/view/viewmodel/BookTest.java

@@ -1,5 +1,6 @@
 /*
- * The MIT License
+ * The MIT License (MIT)
+ *
  * Copyright © 2014-2021 Ilkka Seppälä
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -9,16 +10,19 @@
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Module Model-view-viewmodel is using ZK framework
+ * ZK framework is licensed under LGPL and the license can be found at lgpl-3.0.txt
  */
 
 package com.iluwatar.model.view.viewmodel;