chore: update documentation in readme

Author: stainless-app[bot]

README.md

@@ -21,14 +21,31 @@ brew install stl
 
 ### Installing with Go
 
+To test or install the CLI locally, you need [Go](https://go.dev/doc/install) version 1.22 or later installed.
+
 ```sh
 go install 'github.com/stainless-api/stainless-api-cli/cmd/stl@latest'
 ```
 
+Once you have run `go install`, the binary is placed in your Go bin directory:
+
+- **Default location**: `$HOME/go/bin` (or `$GOPATH/bin` if GOPATH is set)
+- **Check your path**: Run `go env GOPATH` to see the base directory
+
+If commands aren't found after installation, add the Go bin directory to your PATH:
+
+```sh
+# Add to your shell profile (.zshrc, .bashrc, etc.)
+export PATH="$PATH:$(go env GOPATH)/bin"
+```
+
 <!-- x-release-please-end -->
 
 ### Running Locally
 
+After cloning the git repository for this project, you can use the
+`scripts/run` script to run the tool locally:
+
 ```sh
 ./scripts/run args...
 ```