Change CLI to add prompt if no --template parameter is supplied

change/rnpm-plugin-windows-2019-12-16-15-28-08-cli_chooser.json

@@ -0,0 +1,8 @@
+{
+  "type": "minor",
+  "comment": "add prompt to CLI",
+  "packageName": "rnpm-plugin-windows",
+  "email": "kmelmon@microsoft.com",
+  "commit": "364e3cd867a026a9f57f0cb526be03bd5300a39d",
+  "date": "2019-12-16T23:28:08.121Z"
+}

current/local-cli/rnpm/windows/src/windows.js

@@ -8,6 +8,7 @@ const Common = require('./common');
 const chalk = require('chalk');
 const execSync = require('child_process').execSync;
 const path = require('path');
+const prompt = require('@react-native-community/cli/build/tools/generator/promptSync').default();
 
 const REACT_NATIVE_WINDOWS_GENERATE_PATH = function() {
   return path.resolve(
@@ -24,11 +25,16 @@ module.exports = function (config, args, options) {
   const ns = options.namespace ? options.namespace : name;
   const version = options.windowsVersion ? options.windowsVersion : Common.getReactNativeVersion();
 
-  // If the template is not set, look for a stable or 'rc' version
-  const template = options.template ? options.template : 'rc';
-  const ignoreStable = !!options.template;
+  let template = options.template;
+  if (!template) {
+    console.log("What version of react-native-windows would you like to install?  Choose one of:  legacy, latest [default]:");
+    template = prompt();
+    if (template === '') {
+      template = 'vnext'
+    }
+  }
 
-  return Common.getInstallPackage(version, template, ignoreStable)
+  return Common.getInstallPackage(version, template, true)
     .then(rnwPackage => {
       console.log(`Installing ${rnwPackage}...`);
       const pkgmgr = Common.isGlobalCliUsingYarn(process.cwd()) ? 'yarn add' : 'npm install --save';