Add class MinesweeperGame with basic playfield gen.

.gitignore

@@ -23,3 +23,24 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
+
+### Maven ###
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+
+# Eclipse m2e generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# End of https://www.toptal.com/developers/gitignore/api/maven

src/test/java/Minesweeper/MinesweeperGame.java

@@ -0,0 +1,36 @@
+package Minesweeper;
+
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JPanel;
+
+public class MinesweeperGame extends JPanel {
+
+	public MinesweeperGame(int _playfieldSize) {
+		this.setSize(600, 600);
+		setLayout(null);
+		initPlayfield(_playfieldSize);
+	}
+
+	private void initPlayfield(int _playfieldSize) {
+		for (int i = 0; i < _playfieldSize; i++) {
+			for (int j = 0; j < _playfieldSize; j++) {
+				JButton b = new JButton();
+				b.setBounds(j * 40, i * 40, 40, 40);
+				add(b);
+			}
+		}
+	}
+
+	public static void main(String[] args) {
+		JFrame f = new JFrame();
+		MinesweeperGame ttt = new MinesweeperGame(8);
+
+		f.add(ttt);
+		f.setSize(600, 600);
+		f.setLayout(null);
+		f.setVisible(true);
+
+	}
+
+}