Create a client for SLIMS database

[dyf]

We will start pulling instrument.json and rig.json from Agilent SLIMS soon. These will be file attachments to "Instruments" in SLIMS.

• [ ] talk to the SLIMS engineer from AIFI to get an overview of the API
• [ ] set up a basic client that can authenticate with SLIMS
• [ ] using the API, query for instruments by name
• [ ] download the most recent file attachment
• [ ] respond with the contents of this file, which should be valid JSON, on the endpoint /instrument/<instrument-name>