Use required-features for bin tools.

src/bin/README.md

@@ -3,10 +3,38 @@ Rhai Tools
 
 Tools for running Rhai scripts.
 
+| Tool                                                                             | Required feature(s) | Description                                         |
+| -------------------------------------------------------------------------------- | :-----------------: | --------------------------------------------------- |
+| [`rhai-run`](https://github.com/rhaiscript/rhai/blob/main/src/bin/rhai-run.rs)   |                     | runs each filename passed to it as a Rhai script    |
+| [`rhai-repl`](https://github.com/rhaiscript/rhai/blob/main/src/bin/rhai-repl.rs) |     `rustyline`     | simple REPL that interactively evaluates statements |
+| [`rhai-dbg`](https://github.com/rhaiscript/rhai/blob/main/src/bin/rhai-dbg.rs)   |     `debugging`     | the _Rhai Debugger_                                 |
+
 
 How to Run
 ----------
 
-```bash
+```sh
 cargo run --bin sample_app_to_run
 ```
+
+or with required features
+
+```sh
+cargo run --bin sample_app_to_run --features feature1,feature2,feature3
+```
+
+
+How to Install
+--------------
+
+To install these all tools (with [`decimal`] and [`metadata`] support), use the following command:
+
+```sh
+cargo install --path . --bins  --features decimal,metadata,debugging,rustyline
+```
+
+or specifically:
+
+```sh
+cargo install --path . --bin rhai-run  --features decimal,metadata,debugging,rustyline
+```