Search bar and filter for problems

[Ankur1493]

Search bar

Created a search bar to let user search the problems via titles dynamically

Filter

Created a filter, by passing levels as query params, and displaying problems according to that, I could have created a provider and introduced a store, but I think this works great

fixed #29

[siinghd]

I don't like this approach that much, can we do the search on server side? @Ankur1493