add booler function and exports

src/booler.js

@@ -0,0 +1,13 @@
+/**
+ * @author Samob Chea <sombochea@cubetiqs.com>
+ *
+ * Booler can convert any value to Boolean.
+ * 
+ * @param {*} val Value to parse.
+ */
+const booler = (val) => {
+    return val == 't' || val == 'true' || val == 1;
+}
+
+// export module within function name `booler`.
+module.exports = booler;