Add documentation for connect v2

packages/website/md/docs/connect/2.0.0/introduction.md

@@ -0,0 +1,3 @@
+<b>**NOTE:** Release candidate versions are meant to work with V2 of the Standard Relayer API. To interact with V1, select a 1.X version of connect.</b>
+
+Welcome to the [0x Connect](https://github.com/0xProject/0x-monorepo/tree/development/packages/connect) documentation! 0x Connect is a Javascript library that makes it easy to interact with relayers that conform to the [Standard Relayer API](https://github.com/0xProject/standard-relayer-api). Functionality includes getting supported asset pairs from a relayer, getting orders filtered by different attributes, getting individual orders specified by order hash, getting orderbooks for specific asset pairs, getting fee information, and submitting orders.

packages/website/ts/containers/connect_documentation.ts

@@ -10,6 +10,7 @@ import { Translate } from 'ts/utils/translate';
 
 /* tslint:disable:no-var-requires */
 const IntroMarkdownV1 = require('md/docs/connect/1.0.0/introduction');
+const IntroMarkdownV2 = require('md/docs/connect/2.0.0/introduction');
 const InstallationMarkdownV1 = require('md/docs/connect/1.0.0/installation');
 /* tslint:enable:no-var-requires */
 
@@ -33,6 +34,10 @@ const docsInfoConfig: DocsInfoConfig = {
             [markdownSections.introduction]: IntroMarkdownV1,
             [markdownSections.installation]: InstallationMarkdownV1,
         },
+        '2.0.0-rc.1': {
+            [markdownSections.introduction]: IntroMarkdownV2,
+            [markdownSections.installation]: InstallationMarkdownV1,
+        },
     },
     markdownSections,
 };