Add SQL development guidelines and best practices to instructions

[ambilykk]

Pull Request Checklist

• [x ] I have read and followed the CONTRIBUTING.md guidelines.
• [ x] My contribution adds a new instruction, prompt, or chat mode file in the correct directory.
• [ x] The file follows the required naming convention.
• [ x] The content is clearly structured and follows the example format.
• [ x] I have tested my instructions, prompt, or chat mode with GitHub Copilot.
• [ x] I have run node update-readme.js and verified that README.md is up to date.

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Description

Add a new Copilot Instruction file with Guidelines for generating SQL statements and stored procedures. This can be used for converting ER diagrams into Schema generation scripts or can be used for generating new SQL Schema or stored procedures based on best practices.

Type of Contribution

• [ x] New instruction file.
• New prompt file.
• New chat mode file.
• Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull Request Overview

This PR introduces a new Copilot instruction file for SQL development guidelines and updates the README to include it.

• Adds instructions/sql-sp-generation.instructions.md with best practices for schema design, SQL coding style, stored procedures, security, and transactions
• Updates README.md to reference the new SQL Development instructions

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
instructions/sql-sp-generation.instructions.md	New instruction file outlining SQL and SP guidelines
README.md	Added entry for SQL Development instructions

Comments suppressed due to low confidence (2)

instructions/sql-sp-generation.instructions.md:64

• [nitpick] The guidelines recommend both using prepared statements for dynamic SQL and avoiding dynamic SQL in stored procedures, which conflicts. Please clarify when dynamic SQL is acceptable and adjust the wording.

- use prepared statements when executing dynamic SQL

instructions/sql-sp-generation.instructions.md:39

• Using the 'sp_' prefix can lead to lookup performance issues in some SQL engines (e.g., SQL Server searches master DB first). Consider a different naming convention to avoid that.

- prefix stored procedure names with 'sp_'