Add SDK payment-period conduct note

[El-swaggerito]

Description

Difficulty: Hard

Type: Documentation

Summary

Add a short conduct note for contributors during payment periods.

Current Behaviour

Community channels can be flooded with repeated complaints when contributors expect automatic payment.

Expected Behaviour

The SDK repo should remind contributors to avoid spam, review their own work objectively, and follow GrantFox processes.

Suggested Implementation

Add conduct note to contributor docs and README.

Files or Areas Likely Affected

• docs/
• README.md

Acceptance Criteria

• Payment-period conduct note is added.
• Repeated spam or complaints are discouraged.
• Self-review before payment is encouraged.
• GrantFox evaluation process is referenced.
• Tone is firm and professional.
• README links to the note.

Additional Notes

This directly covers the community behaviour side of the message.