astro first commit

readingTime.js

@@ -0,0 +1,10 @@
+import getReadingTime from 'reading-time'
+import { toString } from 'mdast-util-to-string'
+
+export function remarkReadingTime() {
+  return function (tree, { data }) {
+    const textOnPage = toString(tree)
+    const readingTime = getReadingTime(textOnPage)
+    data.astro.frontmatter.readingTime = readingTime
+  }
+}