Document setup script as tip in Install Sui, note cmake as prereq (My…

…stenLabs#1981)

* Document setup script as tip in Install Sui

* Update install.md

Make `cmake` a prerequisite for install

* Update install.md

Add dollar sign

doc/src/build/install.md

@@ -6,6 +6,19 @@ Sui is written in Rust, and we are using Cargo to build and manage the
 dependencies.  As a prerequisite, you will need to [install
 Cargo](https://doc.rust-lang.org/cargo/getting-started/installation.html)
 version 1.60.0 or higher in order to build and install Sui on your machine.
+Also ensure you have `cmake` installed:
+```shell
+$ which cmake
+```
+
+> **Tip:** Assuming you have Rust Cargo, the `git` command, and a GitHub account,
+> you can download the `sui-setup.sh` script and run it to conduct all of the setup
+> below, from a terminal like so:
+> ```shell
+> $ curl https://raw.githubusercontent.com/MystenLabs/sui/main/doc/utils/sui-setup.sh -o sui-setup.sh
+> chmod 755 sui-setup.sh
+> ./sui-setup.sh
+> ```
 
 ## Binaries