docs(v2): blog initial draft (#1786)

* docs(v2): contributing for v2 #1640

* deleted blog.md

* docs(v2): contributing for v2 (#1640)

* docs(v2): blog (#1640)

* Update blog.md

website/docs/blog.md

@@ -3,7 +3,102 @@ id: blog
 title: Blog
 ---
 
-_This section is a work in progress. [Welcoming PRs](https://github.com/facebook/docusaurus/issues/1640)._
+## Initial setup
+
+To setup your site's blog, start by creating a `blog` directory.
+
+Then, add a navbar link to your blog within `docusaurus.config.js`:
+
+```js
+links: [
+    ...
+    {to: 'blog', label: 'Blog', position: 'left'}, // or position: 'right'
+    ...
+]
+```
+
+## Adding posts
+
+To publish in the blog, create a file within the blog directory with a formatted name of `YYYY-MM-DD-my-blog-post-title.md`. The post date is extracted from the file name.
+
+For example, at `my-website/blog/2019-09-05-hello-docusaurus-v2.md`:
+
+```yml
+---
+title: Welcome Docusaurus v2
+author: Dattatreya Tripathy
+authorTitle: Contributor of Docusaurus 2
+authorURL: https://github.com/dt97
+authorTwitter: CuriousDT
+tags: [hello, docusaurus-v2]
+---
+
+Welcome to this blog. This blog is created with [**Docusaurus 2 alpha**]
+(https://v2.docusaurus.io/).
+
+<!--truncate-->
+
+This is my first post on Docusaurus 2.
+
+A whole bunch of exploration to follow.
+```
+
+## Header options
+
+The only required field is `title`; however, we provide options to add author information to your blog post as well along with other options.
+
+- `author` - The author name to be displayed.
+- `authorURL` - The URL that the author's name will be linked to. This could be a GitHub, Twitter, Facebook account URL, etc.
+- `authorImageURL` - The URL to the author's image. (Note: If you use both `authorFBID` and `authorImageURL`, `authorFBID` will take precedence. Don't include `authorFBID` if you want `authorImageURL` to appear.)
+- `title` - The blog post title.
+- `tags` - A list of strings to tag to your post.
+
+## Summary truncation
+
+Use the `<!--truncate-->` marker in your blog post to represent what will be shown as the summary when viewing all published blog posts. Anything above `<!--truncate-->` will be part of the summary. For example:
+
+```yml
+---
+title: Truncation Example
+---
+
+All this will be part of the blog post summary.
+
+Even this.
+
+<!--truncate-->
+
+But anything from here on down will not be.
+
+Not this.
+
+Or this.
+```
+
+## Advanced topics
+
+### Blog-only mode
+
+You can run your Docusaurus 2 site without a landing page and instead have your blog's post list page as the index page. Set the `routeBasePath` to be `'/'` to indicate it's the root path. Make sure there's no `index.js` page in `src/pages` or else there could be a conflict of paths!
+
+```diff
+// docusaurus.config.js
+module.exports = {
+  // ...
+  presets: [
+    [
+      '@docusaurus/preset-classic',
+      {
+        blog: {
+          path: './blog',
++         routeBasePath: '/',
+        },
+      },
+    ],
+  ],
+};
+```
+
 
 <!--