Update exercise information

Author: EficodeRjpalt

challenges/hangperson/hangperson_cheatsheet.md

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+# GitHub Copilot Interaction Cheatsheet
+
+This cheatsheet summarizes key ways to interact with GitHub Copilot in VS Code, based on the Simple Weather CLI exercises. Use this as a quick reference, especially when focusing on code generation.
+
+---
+
+## 1. Main Interaction Interfaces
+
+* **Chat View:**
+    * Primary panel for detailed questions, code generation, explanations.
+    * Use **Participants (`@`)** and **Variables (`#`)** for context.
+    * Use **Slash Commands (`/`)** for specific actions.
+    * Modes like **"Ask"** (default), **"Edits"**, and **"Agent"** (via `/new`) available.
+* **Inline Chat:**
+    * Quick chat directly in the editor (`Cmd+I` / `Ctrl+I`) on selected code.
+    * Great for fast explanations (`/explain`), documentation (`/doc`), or quick edits/fixes (`/fix`).
+    * Review multiple suggestions: `Alt+]` / `Option+]` (Next), `Alt+[` / `Option+[` (Previous).
+
+---
+
+## 2. Providing Context (Crucial for Good Results!)
+
+* **Participants (`@`):** Broad context. **Limit: 1 per prompt.**
+    * `@workspace`: The entire project/workspace content. Good for general questions, brainstorming, and analysis in "Ask" mode.
+    * `@vscode`: VS Code editor features, settings, tasks.
+* **Variables (`#`):** Granular context. **Can be combined** with a participant. Use `#` + start typing (interactive select) or drag/drop files/folders.
+    * `#file:path/to/YourFile.java`: Specific file content.
+    * `#folder:path/to/your/folder`: Specific folder content.
+    * `#selection`: Currently selected code in the editor.
+    * `#sym:YourClassName` or `#sym:yourMethodName`: A specific class, method, or variable symbol.
+    * `#usage:YourSymbolName`: Find where a symbol is used (implementations, calls).
+    * `#codebase`: Workspace context (variable form, often implicitly used or needed for **Edits** / **Agent (`/new`)** modes).
+    * `#changes`: Current staged/unstaged Git changes.
+    * `#terminalLastCommand`: The last command run in the integrated terminal.
+    * `#terminalSelection`: Text selected in the integrated terminal.
+    * `#fetch:URL`: Content from a web URL.
+
+* **`@workspace` vs `#codebase`:**
+    * Both provide project-wide context.
+    * `@workspace` is a *Participant* (use in Ask mode, subject to 1-participant limit).
+    * `#codebase` is a *Variable* (often needed for **Edits** mode or **`/new`** command, doesn't conflict with participant limit).
+
+---
+
+## 3. Directing Copilot's Actions
+
+* **Code Completion:** Automatic suggestions as you type. Press `Tab` to accept.
+* **Slash Commands (`/`):** Use in Chat View or Inline Chat.
+    * `/explain`: Ask for explanations of code (`#selection`, `#file`), concepts, errors (`#terminalSelection`), commands (`#terminalLastCommand`).
+    * `/tests`: Generate unit tests (provide context like `#file:TestFile.java #file:SourceFile.java`).
+    * `/fix`: Suggest fixes for selected code (`#selection`) or based on error messages.
+    * `/new`: Generate new files/scaffolding (Agent mode, often needs `#codebase` or specific instructions).
+    * `/doc`: Generate documentation (usually for `#selection`).
+* **"Edits" Mode (Chat View):**
+    * Select code in the editor.
+    * Choose "Edits" mode in the Chat View input dropdown.
+    * Type natural language instructions for refactoring or modification (e.g., "Extract this logic into a new private method", "Add error handling for...")
+    * Review the proposed diff and apply.
+* **Agent Mode (`/new`):**
+    * Used to create new files/components.
+    * Provide detailed instructions on the structure and content.
+    * Often requires broader context (`#codebase`).
+
+---
+
+## 4. Guiding Copilot's Behavior
+
+* **Custom Instructions:**
+    * Create `.github/copilot-instructions.md` in your project root.
+    * Define rules, patterns, or style guides (e.g., logging practices, preferred libraries).
+    * Copilot automatically uses these instructions to tailor suggestions for the workspace.
+
+---
+
+## 5. Key Activities for Code Generation Focus
+
+* **Scaffolding:** Use `/new #codebase` to create new classes/files based on requirements.
+* **Implementing Methods/Logic:**
+    * Use **Code Completion** for line-by-line help.
+    * Use **Ask Mode** (`@workspace` or `#file` context) to ask "How do I implement...?" or "Show me code to...".
+    * Use **Edits Mode** on method stubs or existing code to add/modify logic based on instructions.
+* **Generating Tests:** Use `/tests` with file context (`#file:Test.java #file:Source.java`).
+* **Refactoring:** Use **Edits Mode** on selected code with instructions like "Refactor...", "Improve...", "Simplify...".
+* **Adding Features:** Combine brainstorming (`@workspace`), planning (`@workspace /explain steps for feature X`), and implementation using Edits/Ask/Completion.
+* **Documentation:** Use `/doc #selection` or Inline Chat (`/doc`).
+
+---