Add intro/part1

intro/part1/README.md

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+# Part 1
+
+To build everything, `cd` into the `part1/` directory and run:
+
+```shell
+elm make Main.elm --output elm.js
+```
+
+This will compile your Main.elm file into `elm.js`, which gets loaded by
+`index.html`.
+
+Then open `index.html` in your browser.
+
+## Exercise
+
+Open `Main.elm` in your editor and resolve the TODOs there.
+
+After you complete each one, re-run `elm make Main.elm --output elm.js` to
+recompile the `elm.js` file, then refresh the browser to see the results!