Update starter kit for detect secrets and pre-commit

[perryzjc]

Purpose

• For issue ticket [Improve Existing Best Practice Guide]: Automated checking for general sensitive information within Git #89, update starter kit for continuous-integration about secret detection

Proposed Changes

• [ADD] Additional pages for starter kit of secret detection

Issues

• issue- [Improve Existing Best Practice Guide]: Automated checking for general sensitive information within Git #89

Testing

• Unit test files are included in the plug-ins folder. Current code passes all the unit tests.
• The Plug-ins also works at other sample repository.

[jpl-jengelke]

We reviewed this PR previously and decided to close it in favor of a more targeted PR:

• Move secrets detection, which is a kind of "Static Application Security Testing" to the Continuous Testing section (see https://github.com/NASA-AMMOS/slim/tree/issue_89)
• Move functional files into Python Starter Kit repo
  • .pre-commit-config.yaml (per example)
  • .detect-secrets/filters or .detect-secrets/plugins directories to hold custom configs
• PR to main detect secrets repo with tests and custom plugins so that they may integrate the changes.
• Template for write-up was created in the above branch

Basically the body of these changes will be reflected differently in the new PR from the issue_89 branch. ... But the changes will be part of the work committed in that branch.

[riverma]

This is an outdated PR. Please see more relevant / updated one here: #95