Proposed issue template forms for bugs and feature requests

[riverma]

• New GitHub template forms for bug reports and new feature requests.
• For live example, check out: https://github.com/nasa/opera-sds-sys/issues/new/choose.
• Both templates automatically tag issue with a new label "needs triage". This label needs to be manually created once for the repository for this automatic tagging to work".
  • Suggested label name: "needs triage"
  • Suggested description: "Issue requires triage to proceed"
  • Suggested color: "#C24247"