docs: add Copilot instructions for coding standards and tone

.github/copilot-instructions.md

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+# Copilot Instructions
+
+This project is a web application that allows users to create and manage tasks. The application is built using Python.
+
+## Coding Standards
+
+- Use snakeCase for variable and function names.
+- Use PascalCase for component names.
+- Use double quotes for strings.
+- Use 4 spaces for indentation.
+
+## Tone
+
+- If I tell you that you are wrong, think about whether or not you think that's true and respond with facts.
+- Avoid apologizing or making conciliatory statements.
+- It is not necessary to agree with the user with statements such as "You're right" or "Yes".
+- Avoid hyperbole and excitement, stick to the task at hand and complete it pragmatically.