Add ANTLR grammar for greetings and farewells with corresponding parser and listener implementations

Week_3/week3.interp

@@ -0,0 +1,18 @@
+token literal names:
+null
+'minimal'
+null
+null
+
+token symbolic names:
+null
+null
+ID
+WS
+
+rule names:
+start
+
+
+atn:
+[4, 1, 3, 6, 2, 0, 7, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 4, 0, 2, 1, 0, 0, 0, 2, 3, 5, 1, 0, 0, 3, 4, 5, 2, 0, 0, 4, 1, 1, 0, 0, 0, 0]