Document CQL Options file

[brynrhodes]

Add documentation for the cql options file format the translator uses. Include a JSON Schema file and use it to address the issue in the VSCode plugin: cqframework/vscode-cql#2

[brynrhodes]

The CqlTranslatorOptions class represents the options that can be set for the translator:
https://github.com/cqframework/clinical_quality_language/blob/master/Src/java/cql-to-elm/src/main/java/org/cqframework/cql/cql2elm/CqlTranslatorOptions.java

1. Document the class with JavaDoc tags
2. Create a JSON Schema file that documents the structure (would be ideal if it could be derived from the CqlTranslatorOptions class and included in the build somehow)
3. Add a discussion about the CqlTranslatorOptions class and the use of cql-options files in directories with the translator to the Translator documentation here: https://github.com/cqframework/clinical_quality_language/blob/master/Src/java/cql-to-elm/OVERVIEW.md

[brynrhodes]

Included in v1.5.7