Add sample javascript sources for testing

Author: Jaewoook

samples/conditional.js

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+switch ('1') {
+    case '1': console.log("aaa");
+}

samples/console.js

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+console.log(
+    ".  .   ." + "\n" +
+    "|  | _ | _. _ ._ _  _" + "\n" +
+    "|/\\|(/.|(_.(_)[ | )(/."
+)

err.js renamed to samples/err.js

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+// var sum = 0;
+// let counter = 0;
+
+while (counter < 5) {
+    sum = 0;
+}
+
+for (var i = 1; i <= 10; i++) {
+    sum += i;
+}

samples/iteration.js

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+var a = 1;
+const b = 123;
+let c;
+const str = "Hello"
+const template_str = `hello`;
+
+function add() {
+    return;
+}

simple.js renamed to samples/simple.js

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+let _null = null;

samples/test.js

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+"use strict";
+const a = 1;

samples/unary.js

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+var a = 1;
+const b = 123;
+let c;
+const str = "Hello"
+const template_str = `hello`;
+
+c = null;