docs: initial content for references.d.ts (#8)

Co-authored-by: Nathan Walker <walkerrunpdx@gmail.com>

Author: Ombuweb

content/project-structure/references-d-ts.md

@@ -0,0 +1,11 @@
+---
+title: references.d.ts
+---
+
+The `references.d.ts` file contains the TypeScript declarations for the platform APIs accessed by the NativeScript app.
+
+```ts
+/// <reference path="../node_modules/@nativescript/types/index.d.ts" />
+
+/// <reference path="./roomdb.d.ts" />
+```

content/sidebar.ts

@@ -90,6 +90,12 @@ export default [
         link: '/project-structure/package-json',
         icon: 'file',
       },
+      { text: 'references.d.ts', link: '/project-structure/references-d-ts', icon: 'file' },
+      {
+        text: 'tsconfig.json',
+        link: '/project-structure/tsconfig-json',
+        icon: 'file',
+      },
       { text: 'webpack.config.js', link: '/webpack', icon: 'file' },
       // {
       //   text: 'package.json',
@@ -105,12 +111,6 @@ export default [
       //     },
       //   ],
       // },
-      {
-        text: 'tsconfig.json',
-        link: '/project-structure/tsconfig-json',
-        icon: 'file',
-      },
-      // { text: 'references.d.ts', link: '//#', icon: 'file' },
     ],
   },
   {