add copilot-instructions.md

Author: ilg-ul

.github/copilot-instructions.md

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+# Copilot Instructions
+
+## Language and Tone
+
+- Use British English spelling and grammar (e.g., "behaviour", "colour", "organise", "analyse", "favour", "innitialise", etc.)
+- Maintain a professional and formal tone in all generated content
+- Avoid colloquialisms, slang, or informal expressions
+- Avoid humour, jokes, or casual remarks
+- Use clear, precise, and professional language appropriate for technical documentation
+- Avoid contractions (e.g., use "do not" instead of "don't")
+- Use the Oxford comma in lists for clarity
+- Maintain consistency in terminology throughout the codebase
+- Prefer "folder" to "directory"
+
+## Code Style
+
+- Follow the existing ESlint TypeScript conventions in this project (`typescript-eslint` rules)
+- Use consistent formatting and naming conventions based on prettier and ESLint configurations
+