docs: streamline README and add missing community & compliance files

[indpriyanshuraj]

Related Issues

Closes #307

Changes

• README.md

  • Updated to reflect the new community documentation.
  • Resolved the missing documentation references reported in [Documentation] README references missing repository files #307.

• CONTRIBUTING.md

  • Added a dedicated contribution guide.
  • Separated development instructions from the README and provided clearer contribution guidance.

• SECURITY.md

  • Added a security policy to support responsible vulnerability reporting.

• CODE_OF_CONDUCT.md

  • Added to fulfill the documentation referenced by the README.

• NOTICE

  • Added to fulfill the documentation referenced by the README and Apache-2.0 Licence requirement

Verification

• Markdown formatting verified.
• Internal documentation links verified.

[indpriyanshuraj]

I am working more to improve it for beginner-friendly use.