Add MVC package structure, PlayingCard and DeckOfCards classes

Add MVC structure where classes for GUI are put in view, entity class PlayingCard and register class DeckOfCards are put in model and the class for collaboration between GUI and backend is put in controller.

.idea/checkstyle-idea.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CheckStyle-IDEA" serialisationVersion="2">
+    <checkstyleVersion>10.13.0</checkstyleVersion>
+    <scanScope>JavaOnly</scanScope>
+    <option name="thirdPartyClasspath" />
+    <option name="activeLocationIds" />
+    <option name="locations">
+      <list>
+        <ConfigurationLocation id="bundled-sun-checks" type="BUNDLED" scope="All" description="Sun Checks">(bundled)</ConfigurationLocation>
+        <ConfigurationLocation id="bundled-google-checks" type="BUNDLED" scope="All" description="Google Checks">(bundled)</ConfigurationLocation>
+      </list>
+    </option>
+  </component>
+</project>
\ No newline at end of file