chore: update README

README.md

@@ -22,6 +22,7 @@ It is heavily inspired by tools like `grpcurl` but built to leverage the safety
 * **Server Reflection**: Can fetch schemas directly from the server, removing the need to pass a local file descriptor set file (`.bin` or `.pb`).
 * **Introspection Tools**: Commands to list services and describe services, messages, and enums.
   * **Local Introspection**: In addition to making network requests, Granc can also be used as a local introspection tool for file descriptor binary files. You can load a local `.bin` file to inspect services, messages, and enums without needing to fetch the schema from a server.
+* **Documentation Generator**: Generate static, cross-linked Markdown documentation for your services and types directly from the schema.
 * **Zero Compilation Dependencies**: Does not require generating Rust code for your protos. Just point to a descriptor file.
 * **Tonic 0.14**: Built on the latest stable Rust gRPC stack.
 
@@ -204,6 +205,34 @@ enum Status {
 
 ```
 
+#### 4. `doc` (Documentation Generator)
+
+Generates static Markdown documentation for a specific service and its dependencies. This is useful for creating browseable documentation for your gRPC APIs.
+
+```bash
+granc doc <SYMBOL> --output <DIR> [OPTIONS]
+
+```
+
+| Argument/Flag | Short | Description |
+| --- | --- | --- |
+| `<SYMBOL>` |  | Fully qualified name of the Service (e.g., `my.package.Service`). |
+| `--output` | `-o` | Directory where the markdown files will be generated. |
+| `--uri` | `-u` | Use Server Reflection to resolve the schema. |
+| `--file-descriptor-set` | `-f` | Use a local file to resolve the schema (offline). |
+
+**Generating docs via Reflection:**
+
+```bash
+granc doc helloworld.Greeter --uri http://localhost:50051 --output ./docs
+```
+
+**Generating docs from a file:**
+
+```bash
+granc doc helloworld.Greeter --file-descriptor-set ./descriptors.bin --output ./docs
+```
+
 ## 🔮 Roadmap
 
 * **Interactive Mode**: A REPL for streaming requests interactively.