feat: Add Option2 exercise

[sanjaykdragon]

I added another exercise for Option, as promised.
Let me know if there are any problems with this.
This one is specifically about if let / while let

[sanjaykdragon]

@fmoko

[shadows-withal]

Hmm, I think this exercise could be structured in a different way. As I see it, you just need to wrap the variables in Some to pass right now, whereas I think a better approach would be to let the user write their own if let and while let statements. Also, you should add a couple of comments about which lines the user should try to edit to nudge them in the right direction.

[sanjaykdragon]

Hmm, I think this exercise could be structured in a different way. As I see it, you just need to wrap the variables in Some to pass right now, whereas I think a better approach would be to let the user write their own if let and while let statements. Also, you should add a couple of comments about which lines the user should try to edit to nudge them in the right direction.

Alright, this is a better idea. I was thinking of doing that, but I felt that leaving the while let / if let sections blank would result in people just changing the entire code. Will change the style now

[shadows-withal]

Looks good! Just a few formatting nits and then we're good.

[sanjaykdragon]

added your nits

[shadows-withal]

Thanks!