README.md updates:

- Add README.md to VSIX when built
- Update the minimum required node version for building.

Closes apache#1108
Closes apache#1136

README.md

@@ -33,7 +33,7 @@ This is an extension for Visual Studio Code (VS Code) which enables the interact
 
 - Java Development Kit (JDK) 8 or higher
 - SBT 0.13.8 or higher
-- Node 10 or higher
+- Node 16 or higher
 - Yarn (https://yarnpkg.com/getting-started/install)
 
 ## Download

webpack/ext-package.webpack.config.js

@@ -101,7 +101,7 @@ module.exports = /** @type WebpackConfig */ {
   plugins: [
     new CopyPlugin({
       patterns: [
-        // { from: 'build/package/.vscodeignore', to: pkg_dir },
+        { from: 'README.md', to: pkg_dir },
         { from: 'build/package/LICENSE', to: `${pkg_dir}` },
         { from: 'build/package/NOTICE', to: `${pkg_dir}` },
         { from: 'dist/styles.css', to: `${pkg_dir}/dist/styles.css` },