title: Pass value to lightning-input tag in LWC
body: <p>Does anyone know how to pass checked value to checkbox in Lightning Web Component? </p>
  
  <p>My code looks like:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>import { LightningElement, track } from 'lwc';
  export default class MyComponent extends LightningElement {
      @track isChecked;
  
      constructor() {
          super();
          isChecked = false;
      }   
  
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;template&gt;
      &lt;lightning-card title="My Card" icon-name="custom:custom9"&gt;
          &lt;div class="slds-m-around_medium"&gt;
                  &lt;lightning-input type="checkbox" label="my checkbox" name="input1" checked="{isChecked}"&gt;&lt;/lightning-input&gt;
          &lt;/div&gt;
      &lt;/lightning-card&gt;    
  &lt;/template&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>and it doesn't work.</p>