feat: add sample app #32
                
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Brief Summary of Changes
This PR adds an example which demonstrates the usage of both video and image widgets in a proper app that can instantly be run on all supported platforms.
Since no one was apparently working on the issue, I thought it was fine if this is my contribution in the context of Hacktoberfest. Please correct me if I am mistaken!
Closes #30
What does this PR address?
Are tests included?
Reviewer, please note:
Since the example is a "manual integration test suite" on its own, I think it is okay (as it is also in most other projects like this) that there are no new tests for it.
Also, I added the
.flutter-plugins*files to the.gitignoresince they should be ignored according to Dart standards.Checklist: