#172: add result list item component

This PR is for #172. I created the component to fit the container's size (in the code, I made the example container 499px to simulate the design). We don't have the mobile design, but I aligned the elements vertically for small screens.

Note that we will need new icons. Currently, I just pass an existing icon on the home page to the test component.

How to Test

Navigate to the search page; an example result component should be on the top.
Change to mobile view and check the mobile layout of this component.

During the development, I found that it would be better to define the exact objects under 'meta' field for the SolrObject.

Originally I have

export interface SolrObject {
  id: string;
  title: string;
  ...
  meta: { [key: string]: string | string[] };
  ...
}

but string | string[] type can cause some problems when passing these meta fields as attributes of the component, so I will work on #176

After this ticket, I will work on #173.

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healthyregions / SDOHPlace