fix: add doc usage update (#15)

Author: vectronic

README.md

@@ -9,13 +9,20 @@
 
 > Project template for a Rust library.
 
-## Usage
+## Project Template Usage
 
 1. Use as a
    [template](https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/creating-a-repository-from-a-template)
    to create a new repository.
 2. Update links and references in `README.md`.
 
+## Cargo Crate Usage
+
+```toml
+[dependencies]
+flowscripter_template_rust_library = "^1"
+```
+
 ## Development
 
 Build: `cargo build`
@@ -30,7 +37,7 @@ Lint: `cargo fmt`
 
 PNG image generated from `images/uml_diagram.mermaid`:
 
-![UML Diagram](images/uml_diagram.png "UML Diagram")
+![UML Diagram](https://raw.githubusercontent.com/flowscripter/template-rust-library/main/images/uml_diagram.png "UML Diagram")
 
 ### API