Add GitHub Copilot instructions for repository (#341)

* Initial plan

* Add GitHub Copilot instructions for Whyis repository

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Fix Python version requirements to match CI configuration (3.8-3.11)

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Update remaining Python version reference to 3.8+

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Improve dependency management guidance to reflect actual project practices

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Add architectural guidance: prefer view infrastructure and plugins over new routes

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Improve clarity of routing guidance with specific examples and criteria

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Add vocabulary file documentation for view registration system

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Add namespace prefix declarations to Turtle examples

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

* Fix database operations section to use current_app.db instead of database module

Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jpmccu <602385+jpmccu@users.noreply.github.com>

Author: Copilot