Improved documentation and updated output file format

This first release of the Berkeley Lab nexport fork includes an improved README.md and an update to the JSON file format to match the upcoming Inference-Engine release version 0.13.0.

What's Changed

• Develop 0.4.6 by @JordanWelsman in #2
• Improve readme by @JordanWelsman in #3
• Merge JordanWelsman/nexport main into BerkeleyLab/nexport main by @rouson in #6
• Add new metadata info in JSON by @zhawhjw in #8
• Remove model link from README.md by @rouson in #9
• Rm test/src subdir by @rouson in #10
• Update keywords in output json file by @zhawhjw in #11
• update: address the usage of 'acceptable_engine_tag' and correct typo by @zhawhjw in #12

New Contributors

• @JordanWelsman made their first contribution in #2
• @rouson made their first contribution in #6
• @zhawhjw made their first contribution in #8

Full Changelog: https://github.com/BerkeleyLab/nexport/commits/1.0.0