Syahmie Week 4 Work

[SyahmieS]

No description provided.

[v-wuzhai]

Please see here: #60 (comment).

[DevPaulLiu]

Well done! Syahmie, great to see you add clear readme file to explain what you have done. Glad to see you use different class to structure the code. And well done using C# linq, lambda, and dealing with exceptions using different exception type.

Here are 2 suggestions:

1. Please only check-in the code, do not include bin, obj files.
2. Create different C# file for different class.