update readme with content

README.md

@@ -1 +1,25 @@
 # gatsby-source-cat-facts
+
+```
+yarn add gatsby-source-cat-facts
+```
+
+Want Cat Facts ([source](https://alexwohlbruck.github.io/cat-facts/)) in your Gatsby app? Yes, obviously we all do.
+
+Install this package, and add `'gatsby-source-cat-facts'` to your plugins array in `gatsby-config.js`. Run `gatsby develop`, head to the GraphiQL IDE and run:
+
+```
+{
+   allCatFacts {
+    catFacts: edges {
+      catFact: node {
+        text
+      }
+    }
+  }
+}
+```
+
+Look! Cat Facts!
+
+🐈