docs: define initial ghidra-cli product

README.md

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+# ghidra-cli
+
+A small, dependable command-line interface for read-only Ghidra analysis.
+
+The project is currently in its design phase. Its first objective is to make
+common reverse-engineering questions easy to ask without exposing Ghidra
+project management, JVM lifecycle, or scripting details to the user.
+
+Proposed usage:
+
+```console
+ghidra-cli doctor
+ghidra-cli inspect ./sample
+ghidra-cli functions ./sample
+ghidra-cli decompile ./sample main
+```
+
+Each command will identify the sample by its content, reuse compatible cached
+analysis, and produce human-readable or versioned JSON output.
+
+## Documents
+
+- [PRD.md](./PRD.md) defines the product requirements and initial delivery
+  scope.
+- [CONTEXT.md](./CONTEXT.md) defines the domain language used throughout the
+  project.
+
+## Status
+
+Documentation first. There is intentionally no Rust crate yet. Implementation
+begins after the initial requirements and interface are reviewed.
+
+## License
+
+No license has been selected yet. Until one is added, all rights are reserved.
+