Adding files for BAEL-2543

core-java/src/main/java/com/baeldung/keyword/Circle.java

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+package com.baeldung.keyword;
+
+public class Circle extends Round implements Shape {
+}

core-java/src/main/java/com/baeldung/keyword/Ring.java

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+package com.baeldung.keyword;
+
+public class Ring extends Round {
+}

core-java/src/main/java/com/baeldung/keyword/Round.java

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+package com.baeldung.keyword;
+
+public class Round {
+}

core-java/src/main/java/com/baeldung/keyword/Shape.java

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+package com.baeldung.keyword;
+
+public interface Shape {
+}

core-java/src/main/java/com/baeldung/keyword/Triangle.java

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+package com.baeldung.keyword;
+
+public class Triangle implements Shape {
+}