Add NLP Sandbox-specific paths to get Badge information

[tschaffter]

Investigate how to generate badges that can be included in the README file of NLP tools. Here are a few ideas for the first badges:

• Show that the implementation is compliant with the NLP Sandbox OpenAPI spec
• Show what version of the NLP Sandbox OpenAPI spec is implemented by the GH repository (e.g. "NLP Sanbdox API: 0.2.1")
• Show what API is implemented by a GH repository (e.g. "NLP Sandbox: Date Annotator")

Interesting badges that shows the performance/rank of a NLP tool or whether the implementation submitted for evaluation is indeed compliant with our specs will be implemented after playing around with the badge concept.

[tschaffter]

Here is an example of query: GET https://img.shields.io/github/v/release/Sage-Bionetworks/nlp-sandbox-schemas.svg?include_prereleases&color=94398d&labelColor=555555&logoColor=ffffff&style=for-the-badge&logo=github

Returns currently this SVG image:

[tschaffter]

https://github.com/puf17640/git-badges