Add example

[lampajr]

Add sample example.

NOTE: the example requires a Horreum server instance up and running at localhost:8080

Changes proposed

The provided example includes how to:

1. Create some Schemas
2. Create a Test
3. Upload a Run

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.