Improve README.md templates

src/ScaffoldPackageCommand.php

@@ -252,6 +252,9 @@ public function package_readme( $args, $assoc_args ) {
 			$readme_args['shields'] = implode( ' ', $composer_obj['extra']['readme']['shields'] );
 		} else {
 			$shields = [];
+			if ( file_exists( $package_dir . '/.github/workflows/testing.yml' ) ) {
+				$shields[] = "[![Testing](https://github.com/{$readme_args['package_name']}/actions/workflows/testing.yml/badge.svg)](https://github.com/{$readme_args['package_name']}/actions/workflows/testing.yml)";
+			}
 			if ( file_exists( $package_dir . '/.travis.yml' ) ) {
 				$shields[] = "[![Build Status](https://travis-ci.org/{$readme_args['package_name']}.svg?branch=master)](https://travis-ci.org/{$readme_args['package_name']})";
 			}

templates/readme-installing.mustache

@@ -1,5 +1,13 @@
 Installing this package {{wp_cli_requires_instructions}}. Update to {{wp_cli_update_to_instructions}}.
 
-Once you've done so, you can install this package with:
+Once you've done so, you can install the latest stable version of this package with:
 
-    wp package install git@github.com:{{package_name}}.git
+```bash
+wp package install {{package_name}}:@stable
+```
+
+To install the latest development version of this package, use the following command instead:
+
+```bash
+wp package install {{package_name}}:dev-master
+```

templates/readme-support.mustache

@@ -1 +1 @@
-Github issues aren't for general support questions, but there are other venues you can try: https://wp-cli.org/#support
+GitHub issues aren't for general support questions, but there are other venues you can try: https://wp-cli.org/#support