Create sample script which prints out unique topics to the console

We want a basic utility script that reads either intRepo_Metadata.json (this one will be easier) or intRepo_Topics.json for all of the unique topics and print them out in alphabetical order. So for example, the topic "c++" may be associated with multiple repositories, but it should only be printed out once as long as it shows up in at least one repository.

I would prefer this script be written in Python (just because the other scraping scripts use Python as well), but I think any language is probably acceptable.