Add notes about error on mixing package names.

[xavierlepretre]

This PR addresses a situation where someone mixes and matches the Go and the Javascript parts of Checkers.

R1: Internal review (B9lab)

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [x] requested
  • [x] completed

R2: External review

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

R3: Internal QA review (B9lab)

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

R4: Final external QA review

• Technical review
  • [ ] requested
  • [ ] completed
• Language review
  • [ ] requested
  • [ ] completed

RC: Release Candidate

• [ ] Ready to be merged

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[CitMC]

@xavierlepretre can you please update the PR overview to reflect in which state it is towards being merged?