README: Add crate layout guide

README.rst

@@ -27,7 +27,18 @@ Each bottle contains a LED with a WS2801 driver. Each crate contains a chain of
 2. Poke a 12mm hole in the lid
 3. Put it in a crate
 4. Repeat from step 1
-5. Stick a loop of LEDs through the lids of the bottles
+5. Stick a loop of LEDs through the lids of the bottles like this:
+   .. code::
+             ┏━━━┯━━━┯━━━┯━━━┯━━━┓
+     {start}→┃ ○ → ○ → ○ → ○ → ○ ┃
+             ┠───┼───┼───┼───┼─↓─┨
+     {  end}←┃ ○ │ ○ ← ○ ← ○ ← ○ ┃
+             ┠─↑─┼─↓─┼───┼───┼───┨
+             ┃ ○ │ ○ → ○ → ○ → ○ ┃
+             ┠─↑─┼───┼───┼───┼─↓─┨
+             ┃ ○ ← ○ ← ○ ← ○ ← ○ ┃
+             ┗━━━┷━━━┷━━━┷━━━┷━━━┛
+
 6. Repeat from step 1
 7. Stack up a bunch of these crates and tie them together with zip ties and straps
 8. Connect all the wires together (mis-)using wonderful XLR connectors