add boilerplate

src/blog/blog.json

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+{
+  "layout": "layout/blog",
+  "tags": "blog"
+}

src/blog/my-first-post.html

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+---
+title: My First Blog Post
+---
+
+<p>This is my first blog post</p>

src/blog/my-second-post.html

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+---
+title: My Second Blog Post
+---
+
+<p>This is my second blog post</p>

src/blog/my-third-post.html

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+---
+title: My Third Blog Post
+---
+
+<p>This is my third and final blog post</p>