title: Using ng add to install ngx-formly in an Angular library
body: <p>Node: <strong>12.16.1</strong></p>
  
  <p>Angular: <strong>9.1.0</strong></p>
  
  <p>Angular CLI: <strong>9.1.0</strong></p>
  
  <p><strong>Problem:</strong> I tried to install <strong>Formly</strong> packages with <strong>ng add</strong> inside an Angular library, but I got:</p>
  
  <pre><code>$ ng add @ngx-formly/schematics --ui-theme=material
  Installing packages for tooling via npm.
  Installed packages for tooling via npm.
  Specified module does not exist
  </code></pre>
  
  <p>1) Is it possible to use <code>ng add</code> in a library?</p>
  
  <p>2) And if it isn't, is it possible to install Formly in my Angular library in another way? Can I have troubles if I install Formly with:</p>
  
  <pre><code>npm install @ngx-formly/core --save
  npm install @ngx-formly/material --save
  </code></pre>