Add landing page source code

landing/README.md

@@ -0,0 +1,27 @@
+Loop Habit Tracker Landing Page
+===============================
+
+This folder contains the source code that generates the project landing page, currently hosted at https://loophabits.org/
+
+Pull requests with ideas for improving it are very welcome.
+
+Build instructions
+------------------
+
+1. Install `haml`:
+```bash
+sudo apt install ruby-haml
+```
+2. Install `pandoc-ruby`:
+```bash
+gem install pandoc-ruby
+```
+3. Run `Makefile`
+```bash
+make
+```
+4. View the results (using, for example, [npm serve](https://www.npmjs.com/package/serve))
+```bash
+npm serve out/
+```
+