improved readme file

Author: yunchengyang515

README.md

@@ -9,10 +9,10 @@ The `stackql/setup-stackql` action is a JavaScript action that sets up StackQL C
 
 This action can be run on `ubuntu-latest`, `windows-latest`, and `macos-latest` GitHub Actions runners, and will install and expose the latest version of the `stackql` CLI on the runner environment.  
 
-# Auth
+# Usage
 [Learn more](https://stackql.io/docs/getting-started/authenticating) about authentication setup when running stackql
 
-### Basic Example
+## Basic Example
 1. Set Auth variable, for example:
 ```
 { "github": { "type": "basic", "credentialsenvvar": "STACKQL_GITHUB_CREDS" } }
@@ -21,8 +21,17 @@ This action can be run on `ubuntu-latest`, `windows-latest`, and `macos-latest`
 3. In the execution step, pass the secret as environment variable with name "STACKQL_GITHUB_CREDS"
 
 Check the "Use GitHub Provider" step in `.github/workflows/setup-stackql.yml` for the working example
+### Example
+```
+    - name: Use GitHub Provider
+      run: |
+        stackql exec -i ./examples/github-example.iql --auth='{ "github": { "type": "basic", "credentialsenvvar": "STACKQL_GITHUB_CREDS" } }'
+      env: 
+        STACKQL_GITHUB_CREDS: ${{  secrets.STACKQL_GITHUB_CREDS }}
+```
+
 
-### json File Auth example
+## json File Auth example
 
 1. Set Auth variable, for example:
 ```
@@ -31,4 +40,28 @@ Check the "Use GitHub Provider" step in `.github/workflows/setup-stackql.yml` fo
 2. encode the key json file into base64 string
 3. in execution step, run `sudo echo ${{ secrets.<name of the secret> }} | base64 -d > sa-key.json`
 
-Check the "Prep Google Creds" step in `.github/workflows/setup-stackql.yml` for the working example
+Check the "Prep Google Creds" step in `.github/workflows/setup-stackql.yml` for the working example
+### Example
+```
+  - name: Prep Google Creds (bash)
+      if: ${{ matrix.os != 'windows-latest' }}
+      run: | ## use the secret to create json file
+        sudo echo ${{ secrets.GOOGLE_CREDS }} | base64 -d > sa-key.json
+
+    - name: Use Google Provider
+      run: | 
+        stackql exec -i ./examples/google-example.iql --auth='{ "google": { "type": "service_account",  "credentialsfilepath": "sa-key.json" }}'
+```
+
+## Input
+- `use_wrapper` - (optional) Whether to install a wrapper to wrap subsequent calls of
+   the `stackql` binary and expose its STDOUT, STDERR, and exit code as outputs
+   named `stdout`, `stderr`, and `exitcode` respectively. Defaults to `false`.
+
+## Outputs
+This action does not configure any outputs directly. However, when you set the `use_wrapper` input
+to `true`, the following outputs are available for subsequent steps that call the `stackql` binary:
+
+- `stdout` - The STDOUT stream of the call to the `stackql` binary.
+- `stderr` - The STDERR stream of the call to the `stackql` binary.
+- `exitcode` - The exit code of the call to the `stackql` binary.