Add prompt structure details to the agentic search section in the README

- add example to #Fragment(README.md:42:1-54:11)

├── README.md
└── apps
    └── editor
        └── src
            ├── constants
            │   └── instructions.ts
            └── features
                └── search-files
                    └── search-modes
                        └── perform-agent-search-mode
                            ├── agents
                            │   ├── antigravity.ts
                            │   ├── claude.ts
                            │   ├── codex.ts
                            │   ├── cursor.ts
                            │   ├── grok.ts
                            │   ├── muse.ts
                            │   └── opencode.ts
                            ├── index.ts
                            ├── types.ts
                            └── utils.ts

Author: robertpiosik

README.md

@@ -53,6 +53,25 @@ Ask your favorite agent for file selection utilizing its one-off prompt (headles
 - Muse Code
 - OpenCode
 
+<details>
+<summary>Structure of the constructed prompt</summary>
+
+```
+# Task
+
+[INSTRUCTIONS]
+
+# Output formatting
+
+Output strictly as a bulleted list of file paths without explanations or any other text (e.g., - path/to/file.ext).
+
+# Query
+
+[PROMPT]
+```
+
+</details>
+
 ### File editing
 
 Implement new features, fix bugs and refactor code across many files.