Add part7

intro/part7/README.md

@@ -0,0 +1,17 @@
+# Part 7
+
+Once again, we'll be building `src/Main.elm`, but editing different files.
+
+To build everything, `cd` into the `part7/` directory and run:
+
+```shell
+elm make src/Main.elm --output ../server/public/elm.js
+```
+
+Then open `http://localhost:3000` in your browser.
+
+## Exercise
+
+The articles in the feed don't quite look right!
+
+We'll fix them by editing `src/Article.elm` and resolving the TODO there.