Add examples folder, and a few javascript input files:

examples/hello-world.js

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+console.log("Hello world!");
+

examples/variable-assignment.js

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+var variable = "supports var keyword";
+let variable2 = "supports let keyword";
+const variable3 = "supports const keyword";
+var numberAssignment = 1;
+let textAssignment = "text";
+const booleanAssignment = true;
+var arrayAssignment = [1, 2, 3];

examples/variable-reassignment.js

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+var variable = "supports var keyword";
+variable = "hello"
+variable = 1
+variable = true
+variable = false
+variable = [1, 2, 3]
+variable = []