Add .gitignore file

SHA: 2af4f14
Reason: push, by reillyeon

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

index.html

@@ -4,9 +4,9 @@
   <title>WebUSB API</title>
   <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
   <link href="https://www.w3.org/StyleSheets/TR/2021/cg-draft" rel="stylesheet">
-  <meta content="Bikeshed version b3a4ecf2c, updated Tue Jul 18 14:02:54 2023 -0700" name="generator">
+  <meta content="Bikeshed version d29f71adb, updated Wed Jul 19 11:08:56 2023 -0700" name="generator">
   <link href="https://wicg.github.io/webusb" rel="canonical">
-  <meta content="20a03855938495bb11751c08bff706f3bc53b349" name="document-revision">
+  <meta content="2af4f14cad508670d4077715fa7fdc860bc55966" name="document-revision">
 <style>
 table {
   border-collapse: collapse;
@@ -921,7 +921,7 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">WebUSB API</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2023-07-18">18 July 2023</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2023-07-21">21 July 2023</time></p>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version: